Measure a distance in 3D

Learn how to evaluate the horizontal, vertical, and direct distances between two points in a 3D Scene.

A distance measurement analysis is a type of measurement analysis that calculates and displays the distance between start point and end point locations. The analysis evaluates the vertical, horizontal, and direct distances between the two 3D points and renders a measurement visualization on-screen.

In this tutorial you will perform and display a distance measurement analysis in a web scene. Using the distance measurement analysis you will measure distances between hotspots in the Yosemite Valley.

Prerequisites

Steps

Open an Xcode project

This tutorial uses the completed Display a web scene tutorial as a starting point. You can first complete that tutorial or download and unzip the completed solution.

1. To start this tutorial, first complete the Display a web scene tutorial or download and unzip the solution.
2. Open the .xcodeproj file in Xcode.

Set the API Key

An API Key enables access to services, web maps, and web scenes hosted in ArcGIS Online.

1. Go to your developer dashboard to get your API key. For these tutorials, use your default API key. It is scoped to include all of the services demonstrated in the tutorials.

2. In Xcode, in the Project Navigator, click AppDelegate.swift.

3. In the editor, set the APIKey property on the AGSArcGISRuntimeEnvironment with your API key.

   
   
   AppDelegate.swift

   Use dark colors for code blocks

   Show more lines

                                      

   Change line

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   https://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   
   import UIKit
   
   import ArcGIS
   
   
   @UIApplicationMain
   class AppDelegate: UIResponder, UIApplicationDelegate {
       var window: UIWindow?
   
       func application(_ application: UIApplication,
                        didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
           // Note: it is not best practice to store API keys in source code.
           // The API key is referenced here for the convenience of this tutorial.
   
           AGSArcGISRuntimeEnvironment.apiKey = "YOUR_API_KEY"
   
           return true
       }
   
   }
   

   Show more lines

Get the web scene item ID

You can use ArcGIS tools to create and view web scenes. Use the Scene Viewer to identify the web scene item ID. This item ID will be used later in the tutorial.

1. Go to the Yosemite Valley Hotspots web scene in the Scene Viewer in ArcGIS Online. This web scene displays terrain and hotspots in the Yosemite Valley.
2. Make a note of the item ID at the end of the browser's URL.

   The item ID should be 7558ee942b2547019f66885c44d4f0b1

Update the scene

1. In Xcode, in the Project Navigator, click ViewController.swift.

2. In the editor, modify the setupScene() method to create an AGSScene for the web scene. To do this, create a portal item providing the web scene's item ID and an AGSPortal referencing ArcGIS Online.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 32 31 30 29 28 28 28 28 28 29 30 31 32 33 34 35 36 37 38 38 38 39 39 39 39 38 37 36 35 34 33 32 31 30 29 28 27 26 26 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 3 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29 -30 -30 -30 -31 -32 -33 -34 -35 -36 -37 -38 -39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49 -50 -51 -52 -53 -54 -55 -56 -57

   Change line

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

Add a UI to control the distance measurement analysis

To control the distance measurement analysis, some UI is required.

1. Define a private method named setupUI(). Create a "Clear" button and assign it to the navigation bar. The clear button removes the distance measurement analysis from the scene.

   You set an action on the clear button using a selector for a method that will be added in a later step.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 47 46 45 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 43 42 42 42 42 42 43 44 45 46 47 48 48 48 48 48 48 48 47 47 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 24 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -9 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29 -30 -31 -32 -33 -34 -35 -36

   Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

2. Define a method named clearScene(_:) and assign it the @objc keyword. This method is performed when the user taps the clear button.

   The @objc method keyword exposes the method to Objective-C, a necessary step for using the UIBarButtonItem API.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 48 47 46 45 44 44 44 44 44 44 44 44 44 44 44 44 44 44 44 43 42 42 42 42 42 43 44 45 46 47 48 49 50 51 51 51 52 52 52 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 29 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 -1 -2 -3 -4 -4 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29 -30 -31

   Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

3. In viewDidLoad(), call the method setupUI().

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 21 22 23 24 25 26 26 26 27 27 27 27 27 27 27 27 27 27 27 27 27 27 26 25 25 25 25 25 25 25 25 25 25 25 25 25 25 24 23 23 23 23 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 0 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 -22 -23 -24 -25 -26 -27 -28 -29 -30 -31 -32 -33 -33 -33 -34 -35 -36 -37 -38 -39 -40 -41 -42 -43 -44 -45 -46 -47 -48 -49 -50 -51 -52 -53 -54 -55 -56 -57 -58 -59 -60

   Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

4. In Xcode, in the Project Navigator, click Main.storyboard.

5. In the editor, select ViewController. In the menu bar, click Editor > Embed In > Navigation Controller.

   More info

   Embedding ViewController within a Navigation Controller will place a navigation bar at the top of ViewController. Inside the navigation bar you will find the UI elements.

6. Check that your UI is set up properly. Press <Command+R> to run the app. You should see a "Clear" button contained by the navigation bar, the default title should be displayed, and the app should load the Yosemite Valley Hotspots web scene.

Format measurements for readability

1. In Xcode, in the Project Navigator, click ViewController.swift.

2. In the editor, create a private static MeasurementFormatter named measurementFormatter. The measurement formatter is used to convert measurement values into strings that are in a format localized to the user's device.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 62 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 60 59 59 59 59 59 59 59 59 59 59 59 59 59 59 58 57 57 57 57 57 58 59 60 61 62 63 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 64 63 63 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 30 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3

   Add line.Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

3. Define a private method named setTitleForDistanceMeasurements(direct:horizontal:vertical:). This method is used to format a string to communicate the direct, horizontal, and vertical measurements to the user, placing the results in the navigation bar's title.

   More info

   Because setTitleForDistanceMeasurements performs a UI operation and you cannot guarantee that it will be called from the main thread, you must ensure that the operation is performed asynchronously on the main thread.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 63 62 61 61 61 61 61 61 61 61 61 61 61 61 61 61 61 60 59 59 59 59 59 59 59 59 59 59 59 59 59 59 58 57 57 57 57 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 79 79 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 46 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19

   Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

Create a distance measurement analysis

Use a AGSLocationDistanceMeasurement to perform and display a distance measurement analysis using 3D points to define the start and end locations.

1. Create a private lazy AGSLocationDistanceMeasurement named measurement. Upon launch, the distance measurement visualization should not be visible.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 87 86 86 86 86 86 86 86 86 86 86 86 86 86 86 86 85 84 84 84 84 84 84 84 84 84 84 84 84 84 84 83 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 83 84 85 86 87 88 89 90 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 90 90 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63

   Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

2. Define a private method named setupAnalysisOverlay() to add the distance measurement analysis to the scene.

   More info

   The distance measurement analysis is added to a scene view using an analysis overlay. An analysis overlay is a container for analyses. It can be used to display visual analyses in a scene view. You can add more than one analysis overlay and they are displayed on top of all other layers.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 88 87 86 86 86 86 86 86 86 86 86 86 86 86 86 86 86 85 84 84 84 84 84 84 84 84 84 84 84 84 84 84 83 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 78 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63 62 61 60 59 58 57 56 55 54 53 52 51

   Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

3. Define a private method named startDistanceMeasurement(point:) that receives a point as a parameter. This method is used to set the distance measurement analysis startLocation.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 96 95 95 95 95 95 95 95 95 95 95 95 95 95 95 95 94 93 93 93 93 93 93 93 93 93 93 93 93 93 93 92 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 91 92 93 94 95 96 97 98 99 100 101 102 102 101 100 99 98 97 96 95 94 93 92 91 90 90 90 89 88 87 86 85 84 83 82 81 80 79 78 77 76 75 74 73 72 71 70 69 68 67 66 65 64 63

   Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

4. Define a private method named moveDistanceMeasurement(point:) that receives a point as a parameter. This method is used to set the distance measurement analysis endLocation and make it visible, if it's not visible already.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 102 101 101 101 101 101 101 101 101 101 101 101 101 101 101 101 100 99 99 99 99 99 99 99 99 99 99 99 99 99 99 98 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 97 98 99 100 101 102 103 104 105 106 107 108 109 109 108 107 106 105 104 104 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87 86 85 84 83 82 81 80 79 78 77

   Add line.Add line.Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

5. Define a private method named clearMeasurement(). This method is used to hide the distance measurement analysis.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 109 108 107 107 107 107 107 107 107 107 107 107 107 107 107 107 107 106 105 105 105 105 105 105 105 105 105 105 105 105 105 105 104 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 103 104 105 106 107 108 109 110 111 112 113 114 114 114 114 113 112 111 110 109 108 107 106 105 104 103 102 101 100 99 98 97 96 95 94 93 92 91 90 89 88 87

   Add line.Add line.Add line.Add line.

   1
   2
   3
   4
   5
   6
   7
   8
   9
   10
   11
   12
   13
   14
   15
   16
   17
   18
   19
   20
   21
   22
   23
   24
   25
   26
   27
   28
   29
   30
   31
   32
   33
   34
   35
   36
   37
   38
   39
   40
   41
   42
   43
   44
   45
   46
   47
   48
   49
   50
   51
   52
   53
   54
   55
   56
   57
   58
   59
   60
   61
   62
   63
   64
   65
   66
   67
   68
   69
   70
   71
   72
   73
   74
   75
   76
   77
   78
   79
   80
   81
   82
   83
   84
   85
   86
   87
   88
   89
   90
   91
   92
   93
   94
   95
   96
   97
   98
   99
   100
   101
   102
   103
   104
   105
   106
   107
   108
   109
   110
   111
   112
   113
   114
   115
   116
   117
   118
   119
   120
   121
   122
   123
   124
   125
   126
   127
   128
   129
   130
   131
   132
   133
   134
   135
   136
   137
   138
   139
   140
   141
   142
   143
   144
   145
   146
   147
   148
   149
   150
   // Copyright 2021 Esri
   //
   // Licensed under the Apache License, Version 2.0 (the "License");
   // you may not use this file except in compliance with the License.
   // You may obtain a copy of the License at
   //
   //   http://www.apache.org/licenses/LICENSE-2.0
   //
   // Unless required by applicable law or agreed to in writing, software
   // distributed under the License is distributed on an "AS IS" BASIS,
   // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   // See the License for the specific language governing permissions and
   // limitations under the License.
   
   import ArcGIS
   import UIKit
   
   class ViewController: UIViewController {
       @IBOutlet weak var sceneView: AGSSceneView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupScene()
   
           setupUI()
   
           setupAnalysisOverlay()
   
       }
   
       // MARK: Scene
   
       private func setupScene() {
           let scene: AGSScene = {
               let portal = AGSPortal.arcGISOnline(withLoginRequired: false)
   
               let item = AGSPortalItem(portal: portal, itemID: "7558ee942b2547019f66885c44d4f0b1")
   
               return AGSScene(item: item)
           }()
           sceneView.scene = scene
   
           sceneView.touchDelegate = self
   
       }
   
       // MARK: UI
   
       private func setupUI() {
           navigationItem.title = "Long press and drag."
           let clear = UIBarButtonItem(title: "Clear", style: .plain, target: self, action: #selector(clearScene))
           navigationItem.rightBarButtonItem = clear
       }
   
       @objc
       func clearScene(_ sender: UIBarButtonItem) {
   
           clearMeasurement()
   
       }
   
       // MARK: Distance Measurement Formatter
   
       private static let measurementFormatter: MeasurementFormatter = {
           let measurementFormatter = MeasurementFormatter()
           measurementFormatter.numberFormatter.minimumFractionDigits = 2
           measurementFormatter.numberFormatter.maximumFractionDigits = 2
           return measurementFormatter
       }()
   
       private func setTitleForDistanceMeasurements(direct: AGSDistance, horizontal: AGSDistance, vertical: AGSDistance) {
           DispatchQueue.main.async { [weak self] in
               guard let self = self else { return }
               if self.measurement.isVisible {
                   self.navigationItem.title = String(
                       format: "Direct: %@ | Horizontal: %@ | Vertical: %@",
                       Self.measurementFormatter.string(from: Measurement(value: direct.value, unit: Unit(symbol: direct.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: horizontal.value, unit: Unit(symbol: horizontal.unit.abbreviation))),
                       Self.measurementFormatter.string(from: Measurement(value: vertical.value, unit: Unit(symbol: vertical.unit.abbreviation)))
                   )
               } else {
                   self.navigationItem.title = "Long press and drag."
               }
           }
       }
   
       // MARK: Distance Measurement Analysis
   
       private lazy var measurement: AGSLocationDistanceMeasurement = {
           let point = AGSPointMake3D(0, 0, 0, 0, .wgs84())
           let measurement = AGSLocationDistanceMeasurement(startLocation: point, endLocation: point)
           measurement.measurementChangedHandler = setTitleForDistanceMeasurements
           measurement.isVisible = false
           measurement.unitSystem = .metric // .imperial
           return measurement
       }()
   
       private func setupAnalysisOverlay() {
           let analysisOverlay = AGSAnalysisOverlay()
           analysisOverlay.analyses.add(measurement)
           sceneView.analysisOverlays.add(analysisOverlay)
       }
   
       private func startDistanceMeasurement(point: AGSPoint) {
           measurement.isVisible = false
           measurement.startLocation = point
           measurement.endLocation = point
       }
   
       private func moveDistanceMeasurement(point: AGSPoint) {
           measurement.endLocation = point
           if !measurement.isVisible {
               measurement.isVisible = true
           }
       }
   
       private func clearMeasurement() {
           measurement.isVisible = false
           navigationItem.title = "Long press and drag."
       }
   
   }
   
   extension ViewController: AGSGeoViewTouchDelegate {
   
       func geoView(_ geoView: AGSGeoView, didLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           startDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didMoveLongPressToScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoView(_ geoView: AGSGeoView, didEndLongPressAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
   
           moveDistanceMeasurement(point: mapPoint)
   
       }
   
       func geoViewDidCancelLongPress(_ geoView: AGSGeoView) {
   
           clearMeasurement()
   
       }
   
   }
   

   Show more lines

6. Call clearMeasurement() when the user taps the "Clear" button.

   ViewController.swift

   Use dark colors for code blocks

   Show more lines

   54 54