Add features (feature service)

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Sample viewer app

Add features to a feature layer.

Add features (feature service) sample

Use case

An end-user performing a survey may want to add features to the map during the course of their work.

How to use the sample

Tap on a location on the map to add a feature at that location.

How it works

An AGSFeature instance is added to an AGSServiceFeatureTable. Apply edits on the ServiceGeodatabase which contains the feature table to push the edits to the server.

  1. Create and load an AGSServiceFeatureTable with a feature service URL.
  2. Get the AGSServiceFeatureTable from the service geodatabase.
  3. Create an AGSFeatureLayer from the service feature table.
  4. Create an AGSFeature with attributes and a location using the AGSServiceFeatureTable.
  5. Add the AGSFeature to the AGSServiceFeatureTable.
  6. Apply edits to the AGSServiceGeodatabase by calling AGSServiceFeatureTable.applyEdits(completion:), which will upload the new feature to the online service.

Relevant API

  • AGSFeature
  • AGSFeatureEditResult
  • AGSFeatureLayer
  • AGSServiceFeatureTable
  • AGSServiceGeodatabase

Tags

edit, feature, online service

Sample Code

AddFeaturesViewController.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 AddFeaturesViewController: UIViewController, AGSGeoViewTouchDelegate {
    @IBOutlet var mapView: AGSMapView! {
        didSet {
            mapView.map = AGSMap(basemapStyle: .arcGISStreets)
            // Set touch delegate on map view as self.
            mapView.touchDelegate = self
        }
    }

    /// The service geodatabase that contains damaged property features.
    var serviceGeodatabase: AGSServiceGeodatabase!
    /// The feature table to add features to.
    var featureTable: AGSServiceFeatureTable!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Add the source code button item to the right of navigation bar.
        (navigationItem.rightBarButtonItem as? SourceCodeBarButtonItem)?.filenames = ["AddFeaturesViewController"]

        // 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)
                self.mapView.map?.operationalLayers.add(featureLayer)
                self.mapView.setViewpoint(AGSViewpoint(center: AGSPoint(x: 544871.19, y: 6806138.66, spatialReference: .webMercator()), scale: 2e6))
            }
        }
    }

    /// Add a feature at the tapped point.
    /// - Parameter mapPoint: The point where user tapped.
    func addFeature(at mapPoint: AGSPoint) {
        // Disable interaction with map view.
        mapView.isUserInteractionEnabled = false

        // Normalize geometry.
        let normalizedGeometry = AGSGeometryEngine.normalizeCentralMeridian(of: mapPoint)!

        // Attributes for the new feature.
        let featureAttributes = ["typdamage": "Minor", "primcause": "Earthquake"]
        // Create a new feature.
        let feature = featureTable.createFeature(attributes: featureAttributes, geometry: normalizedGeometry)

        // Add the feature to the feature table.
        featureTable.add(feature) { [weak self] (error: Error?) in
            guard let self = self else { return }
            // Enable interaction with map view.
            self.mapView.isUserInteractionEnabled = true

            if let error = error {
                self.presentAlert(message: "Error while adding feature: \(error.localizedDescription)")
            } else {
                // Applied edits on success.
                self.applyEdits()
            }
        }
    }

    /// Apply local edits to the geodatabase.
    func applyEdits() {
        guard serviceGeodatabase.hasLocalEdits() else { return }
        serviceGeodatabase.applyEdits { [weak self] _, error in
            if let error = error {
                self?.presentAlert(message: "Error while applying edits: \(error.localizedDescription)")
            }
        }
    }

    // MARK: - AGSGeoViewTouchDelegate

    func geoView(_ geoView: AGSGeoView, didTapAtScreenPoint screenPoint: CGPoint, mapPoint: AGSPoint) {
        // Add a feature at the tapped location.
        addFeature(at: mapPoint)
    }
}

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