Search for an address

Prerequisites

Steps

Open a Xcode project

1. To start the tutorial, complete the Display a map tutorial or download and unzip the solution.

2. Open the .xcodeproj file in Xcode.

3. If you downloaded the solution project, set your API key.

   More info

   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

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      // 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
          }
      
      }
      

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Add a search bar to the UI

To search an address using the application, add a UI element to prompt the user for text input.

The text input will be used as the geocode search text in a later step.

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

2. In the editor, extend ViewController to conform to the UISearchBarDelegate protocol.

   More info

   The UISearchBarDelegate will allow ViewController to receive user interaction messages from a UISearchBar.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

3. Define a private method named setupSearchBar(). In setupSearchBar() create an UISearchBar with these initial values and assign it to navigationItem.titleView.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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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 search bar.

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

7. In the editor, in the viewDidLoad() method, call setupSearchBar().

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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Add graphics to the map view

A graphics overlay is a container for graphics. Graphics are added as a visual means to display the search result on the map.

1. Create a private AGSGraphic property named textGraphic. This graphic will be used to display the result's text label.

   More info

   An AGSTextSymbol is used to display text at a location on the map view.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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2. Create a private AGSGraphic property named markerGraphic. This graphic will be used to display the result's location.

   More info

   An AGSSimpleMarkerSymbol is used to display a location on the map view.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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3. Define a private method named setupGraphics(). In setupGraphics() create an AGSGraphicsOverlay. Append textGraphic and markerGraphic to the graphics overlay then add the graphics overlay to the map view.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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   More info

   Because textGraphic and markerGraphic haven't yet specified a geometry, they will not be visible.

4. In the viewDidLoad() method, call setupGraphics().

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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Define app geocode results status

The app will leverage a state-machine design pattern to ensure the contents of the map reflect the state of the search result. This design pattern supports wrangling multiple asynchronous requests to the world geocoding service into a single state variable result, ensuring the reliability of search results.

1. Define an enum named ResultStatus with two cases. The first case, none, is used when there is no result or an error is returned. The second case, result, is used when a result is found.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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2. Create a ResultStatus property named status. Setting this property will update textGraphic and markerGraphic with values from the result.

   ViewController.swift

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   // Copyright 2020 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
   
   class ViewController: UIViewController {
       @IBOutlet weak var mapView: AGSMapView!
   
       override func viewDidLoad() {
           super.viewDidLoad()
           setupMap()
   
           setupSearchBar()
   
           setupGraphics()
   
       }
   
       // MARK: - Map
   
       private func setupMap() {
           mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
           mapView.setViewpoint(
               AGSViewpoint(
                   latitude: 34.02700,
                   longitude: -118.80543,
                   scale: 144447.638572
               )
           )
       }
   
       // MARK: - Search Bar
   
       private func setupSearchBar() {
           navigationItem.titleView = {
               let searchBar = UISearchBar()
               searchBar.delegate = self
               searchBar.showsCancelButton = true
               searchBar.placeholder = "Search for an address"
               return searchBar
           }()
       }
   
   
       // MARK: - Graphics
   
       private func setupGraphics() {
           let graphicsOverlay = AGSGraphicsOverlay()
           graphicsOverlay.graphics.addObjects(from: [textGraphic, markerGraphic])
           mapView.graphicsOverlays.add(graphicsOverlay)
       }
   
       private let textGraphic: AGSGraphic = {
           let textSymbol = AGSTextSymbol(
               text: "",
               color: .black,
               size: 14,
               horizontalAlignment: .center,
               verticalAlignment: .bottom
           )
           return AGSGraphic(geometry: nil, symbol: textSymbol)
       }()
   
       private let markerGraphic: AGSGraphic = {
           let markerSymbol = AGSSimpleMarkerSymbol(
               style: .square,
               color: .red,
               size: 12
           )
           return AGSGraphic(geometry: nil, symbol: markerSymbol)
       }()
   
       // MARK: - Result
   
       enum ResultStatus {
           case none
           case result(String, AGSPoint)
       }
   
       var status: ResultStatus = .none {
           didSet {
               switch status {
               case .none:
                   (textGraphic.symbol as! AGSTextSymbol).text = ""
                   textGraphic.geometry = nil
                   markerGraphic.geometry = nil
               case .result(let title, let location):
                   (textGraphic.symbol as! AGSTextSymbol).text = title
                   textGraphic.geometry = location
                   markerGraphic.geometry = location
               }
           }
       }
   
       // MARK: - Geocoding
   
       private let locator = AGSLocatorTask(
           url: URL(string: "https://geocode-api.arcgis.com/arcgis/rest/services/World/GeocodeServer")!
       )
   
       private var currentGeocodeOperation: AGSCancelable?
   
       private func geocode(with searchText: String) {
           currentGeocodeOperation?.cancel()
   
           let parameters: AGSGeocodeParameters = {
               let parameters = AGSGeocodeParameters()
               parameters.resultAttributeNames = ["*"]
               parameters.maxResults = 1
               parameters.outputSpatialReference = mapView.spatialReference
               return parameters
           }()
   
           currentGeocodeOperation = self.locator.geocode(withSearchText: searchText, parameters: parameters) { [weak self] (results, error) in
               guard let self = self else { return }
               if let error = error {
                   self.status = .none
                   print(error.localizedDescription)
                   return
               } else if let firstResult = results?.first,
                         let extent = firstResult.extent,
                         let location = firstResult.displayLocation {
                   self.status = .result(firstResult.label, location)
                   self.mapView.setViewpointGeometry(extent)
               } else {
                   self.status = .none
                   print("No results found for \(searchText).")
               }
           }
   
       }
   
   }
   
   extension ViewController: UISearchBarDelegate {
   
       func searchBarSearchButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
           guard let searchText = searchBar.text, !searchText.isEmpty else {
               print("Nothing to search!")
               return
           }
           geocode(with: searchText)
       }
   
       func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {
           searchBar.resignFirstResponder()
       }
   
   }
   

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