Edit features (connected)

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Sample viewer app

View, edit, or add features using a popup.

Map with features List of templates Editable information list

Use case

An end-user performing a survey may want to view, edit, or add features on a map using a popup during the course of their work.

How to use the sample

Pan and zoom to explore various features. Tap on an existing feature to view or edit its data. Tap the "Add new feature" button to add a new feature to the map.

How it works

  1. Create and load an AGSServiceGeodatabase with a feature service URL.
  2. Get the AGSServiceFeatureTable from the service geodatabase.
  3. Create an AGSFeatureLayer from the service feature table.
  4. Select features using AGSGeoView.identifyLayer(_:screenPoint:tolerance:returnPopupsOnly:maximumResults:completion:) and AGSIdentifyLayerResult.
  5. Create an AGSPopup to display data and allow editing.
  6. Create a new feature with a specific template using AGSArcGISFeatureTable.createFeature(with:).
  7. Update the data on the server using AGSServiceGeodatabase.applyEdits(completion:) on the AGSServiceGeodatabase, which apply the changes on the online service.

Relevant API

  • AGSFeatureLayer
  • AGSFeatureTemplate
  • AGSPopup
  • AGSServiceFeatureTable
  • AGSServiceGeodatabase

Tags

details, edit, editing, feature, information, popup, template, value

Sample Code

EditFeaturesOnlineViewController.swiftFeatureTemplatePickerViewController.swift
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// Copyright 2016 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 UIKit
import ArcGIS

class EditFeaturesOnlineViewController: UIViewController, AGSGeoViewTouchDelegate, AGSPopupsViewControllerDelegate, FeatureTemplatePickerDelegate {
    @IBOutlet var mapView: AGSMapView! {
        didSet {
            mapView.map = AGSMap(basemapStyle: .arcGISTopographic)
            // Set touch delegate on map view as self.
            mapView.touchDelegate = self
            // Assign the sketch editor to map view.
            mapView.sketchEditor = sketchEditor
        }
    }
    @IBOutlet var sketchToolbar: UIToolbar!
    @IBOutlet var doneBarButtonItem: UIBarButtonItem!

    /// The service geodatabase that contains damaged property features.
    var serviceGeodatabase: AGSServiceGeodatabase!
    /// The feature layer created from the service geodatabase.
    var featureLayer: AGSFeatureLayer!
    /// The feature table to edit features.
    var featureTable: AGSServiceFeatureTable!
    /// The sketch editor on the map view for editing the feature.
    var sketchEditor = AGSSketchEditor()
    /// The popup view controller to view and edit feature attributes.
    var popupsViewController: AGSPopupsViewController!
    /// Last identify operation.
    var lastQuery: AGSCancelable!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Add the source code button item to the right of navigation bar.
        (navigationItem.rightBarButtonItem as? SourceCodeBarButtonItem)?.filenames = ["EditFeaturesOnlineViewController", "FeatureTemplatePickerViewController"]
        // Load the service geodatabase.
        let damageFeatureService = URL(string: "https://sampleserver6.arcgisonline.com/arcgis/rest/services/DamageAssessment/FeatureServer")!
        loadServiceGeodatabase(from: damageFeatureService)
    }

    /// Load and set a service geodatabase from a feature service URL.
    /// - Parameter serviceURL: The URL to the feature service.
    func loadServiceGeodatabase(from serviceURL: URL) {
        let serviceGeodatabase = AGSServiceGeodatabase(url: serviceURL)
        serviceGeodatabase.load { [weak self] error in
            guard let self = self else { return }
            if let error = error {
                self.presentAlert(error: error)
            } else {
                let featureTable = serviceGeodatabase.table(withLayerID: 0)!
                self.featureTable = featureTable
                self.serviceGeodatabase = serviceGeodatabase
                // Add the feature layer to the operational layers on map.
                let featureLayer = AGSFeatureLayer(featureTable: featureTable)
                // Store the feature layer for later use.
                self.featureLayer = featureLayer
                self.mapView.map?.operationalLayers.add(featureLayer)
                self.mapView.setViewpoint(AGSViewpoint(center: AGSPoint(x: -9184518.55, y: 3240636.90, spatialReference: .webMercator()), scale: 7e5))
            }
        }
    }

    private func dismissFeatureTemplatePickerViewController() {
        self.dismiss(animated: true)
    }

    /// Apply local edits to the geodatabase.
    func applyEdits() {
        if serviceGeodatabase.hasLocalEdits() {
            serviceGeodatabase.applyEdits { [weak self] featureTableEditResults, error in
                guard let self = self else { return }
                if let featureTableEditResults = featureTableEditResults,
                   featureTableEditResults.first?.editResults.first?.completedWithErrors == false {
                    self.presentAlert(message: "Edits applied successfully!")
                } else if let error = error {
                    self.presentAlert(message: "Error while applying edits: \(error.localizedDescription)")
                }
            }
        }
    }

    // MARK: - AGSGeoViewTouchDelegate

    func geoView(_ geoView: AGSGeoView, didTapAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
        if let lastQuery = self.lastQuery {
            lastQuery.cancel()
        }

        self.lastQuery = self.mapView.identifyLayer(self.featureLayer, screenPoint: screenPoint, tolerance: 12, returnPopupsOnly: false, maximumResults: 10) { [weak self] (identifyLayerResult: AGSIdentifyLayerResult) in
            guard let self = self else { return }
            if let error = identifyLayerResult.error {
                print(error)
            } else if !identifyLayerResult.geoElements.isEmpty {
                let popups = identifyLayerResult.geoElements.map(AGSPopup.init(geoElement:))
                self.popupsViewController = AGSPopupsViewController(popups: popups, containerStyle: .navigationBar)
                self.popupsViewController.modalPresentationStyle = .formSheet
                self.popupsViewController.isModalInPresentation = true
                self.present(self.popupsViewController, animated: true)
                self.popupsViewController.delegate = self
            }
        }
    }

    // MARK: - AGSPopupsViewControllerDelegate methods

    func popupsViewController(_ popupsViewController: AGSPopupsViewController, sketchEditorFor popup: AGSPopup) -> AGSSketchEditor? {
        if let geometry = popup.geoElement.geometry {
            // Start sketch editing.
            self.mapView.sketchEditor?.start(with: geometry)

            // Zoom to the existing feature's geometry.
            self.mapView.setViewpointGeometry(geometry.extent, padding: 10, completion: nil)
        }

        return self.sketchEditor
    }

    func popupsViewController(_ popupsViewController: AGSPopupsViewController, readyToEditGeometryWith sketchEditor: AGSSketchEditor?, for popup: AGSPopup) {
        // Dismiss the popup view controller.
        self.dismiss(animated: true)

        // Prepare the current view controller for sketch mode.
        self.mapView.callout.isHidden = true

        // Hide the back button.
        self.navigationItem.hidesBackButton = true

        // Disable the code button.
        self.navigationItem.rightBarButtonItem?.isEnabled = false

        // Unhide the sketchToolbar.
        self.sketchToolbar.isHidden = false

        // Disable the done button until any geometry changes.
        self.doneBarButtonItem.isEnabled = false

        NotificationCenter.default.addObserver(self, selector: #selector(EditFeaturesOnlineViewController.sketchChanged(_:)), name: .AGSSketchEditorGeometryDidChange, object: nil)
    }

    func popupsViewController(_ popupsViewController: AGSPopupsViewController, didCancelEditingFor popup: AGSPopup) {
        // Stop sketch editor.
        self.disableSketchEditor()
    }

    func popupsViewController(_ popupsViewController: AGSPopupsViewController, didFinishEditingFor popup: AGSPopup) {
        // Stop sketch editor.
        self.disableSketchEditor()

        let feature = popup.geoElement as! AGSFeature

        // Simplify the geometry, which will take care of self intersecting
        // polygons and normalize the geometry, which will take care of
        // geometries that extend beyone the dateline (if wraparound was enabled
        // on the map)
        feature.geometry = AGSGeometryEngine.simplifyGeometry(feature.geometry!)
        feature.geometry = AGSGeometryEngine.normalizeCentralMeridian(of: feature.geometry!)

        // Apply edits.
        self.applyEdits()
    }

    func popupsViewControllerDidFinishViewingPopups(_ popupsViewController: AGSPopupsViewController) {
        // Dismiss the popups view controller.
        self.dismiss(animated: true)

        self.popupsViewController = nil
    }

    @objc
    func sketchChanged(_ notification: Notification) {
        // Check if the sketch geometry is valid to decide whether to enable
        // the sketchCompleteButton.
        if let geometry = self.mapView.sketchEditor?.geometry, !geometry.isEmpty {
            self.doneBarButtonItem.isEnabled = true
        }
    }

    @IBAction func sketchDoneAction() {
        // Enable or unhide navigation bar button.
        self.navigationItem.hidesBackButton = false
        self.navigationItem.rightBarButtonItem?.isEnabled = true

        // Present the popups view controller again.
        self.present(self.popupsViewController, animated: true)

        // Remove self as observer for notifications.
        NotificationCenter.default.removeObserver(self, name: .AGSSketchEditorGeometryDidChange, object: nil)
    }

    private func disableSketchEditor() {
        // Stop sketch editor.
        self.mapView.sketchEditor?.stop()

        // Hide sketch toolbar.
        self.sketchToolbar.isHidden = true
    }

    // MARK: - Navigation

    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "FeatureTemplateSegue",
           let navigationController = segue.destination as? UINavigationController,
           let featureTemplatePickerViewController = navigationController.topViewController as? FeatureTemplatePickerViewController {
            featureTemplatePickerViewController.addTemplatesFromLayer(featureLayer)
            featureTemplatePickerViewController.delegate = self
        }
    }

    // MARK: - FeatureTemplatePickerDelegate

    func featureTemplatePickerViewController(_ controller: FeatureTemplatePickerViewController, didSelectFeatureTemplate template: AGSFeatureTemplate, forFeatureLayer featureLayer: AGSFeatureLayer) {
        // Create a new feature based on the template.
        let newFeature = featureTable.createFeature(with: template)!

        // Set the geometry as the center of the screen.
        if let visibleArea = self.mapView.visibleArea {
            newFeature.geometry = visibleArea.extent.center
        } else {
            newFeature.geometry = AGSPoint(x: 0, y: 0, spatialReference: .webMercator())
        }

        // Initialize a popup definition using the feature layer.
        let popupDefinition = AGSPopupDefinition(popupSource: self.featureLayer)
        // Create a popup.
        let popup = AGSPopup(geoElement: newFeature, popupDefinition: popupDefinition)

        // Initialize popups view controller.
        self.popupsViewController = AGSPopupsViewController(popups: [popup], containerStyle: .navigationBar)
        self.popupsViewController.delegate = self

        // Only for iPad, set presentation style to Form sheet.
        // We don't want it to cover the entire screen.
        self.popupsViewController.modalPresentationStyle = .formSheet
        self.popupsViewController.isModalInPresentation = true

        // First, dismiss the Feature Template Picker.
        self.dismiss(animated: false)

        // Next, Present the popup view controller.
        self.present(self.popupsViewController, animated: true) { [weak self] in
            self?.popupsViewController.startEditingCurrentPopup()
        }
    }

    func featureTemplatePickerViewControllerWantsToDismiss(_ controller: FeatureTemplatePickerViewController) {
        self.dismissFeatureTemplatePickerViewController()
    }
}

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