Add a feature layer

Before starting this tutorial:

1. You need an ArcGIS Location Platform or ArcGIS Online account.

2. Your system meets the system requirements.

Option 1: Develop the code

To start the tutorial, complete the Display a map tutorial. This creates a map to display the Santa Monica Mountains in California using the topographic basemap from the ArcGIS basemap styles service. You can choose to implement either API key authentication or user authentication.

Continue with the following instructions to use a URL to access and display a feature layer in a map.

Add a feature layer to the map

In the project navigator, open the ContentView.swift file. Update the map object. Create a ServiceFeatureTable to access the trail heads data and a FeatureLayer to view it. Add the layer to the map's operational layers.

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
    @State private var map: Map = {
        let map = Map(basemapStyle: .arcGISTopographic)

        map.initialViewpoint = Viewpoint(latitude: 34.02700, longitude: -118.80500, scale: 72_000)

        let featureServiceURL = URL(string: "https://services3.arcgis.com/GVgbJbqm8hXASVYi/arcgis/rest/services/Trailheads/FeatureServer/0")!
        let serviceFeatureTable = ServiceFeatureTable(url: featureServiceURL)
        let trailheadsLayer = FeatureLayer(featureTable: serviceFeatureTable)
        map.addOperationalLayer(trailheadsLayer)

        return map
    }()

Run the solution

Press Command + R to run the app.

You should see point, line, and polygon features (representing trailheads, trails, and parks) draw on the map for an area in the Santa Monica Mountains.

Option 2: Download the solution

1. Click the Download solution link under Solution and unzip the file to a location on your machine.

2. Open the .xcodeproj file in Xcode.

Since the downloaded solution does not contain authentication credentials, you must first set up authentication to create credentials, and then add the developer credentials to the solution.

Set developer credentials in the solution

To access the secure ArcGIS location services used in this tutorial, you must implement API key authentication or user authentication using an ArcGIS Location Platform or an ArcGIS Online account.

Set developer credentials

To allow your app users to access ArcGIS location services, pass the developer credentials that you created in the Set up authentication step to the application's ArcGISEnvironment.

Run the solution

Press Command + R to run the app.

You should see point, line, and polygon features (representing trailheads, trails, and parks) draw on the map for an area in the Santa Monica Mountains.