Display a web map

Learn how to create and display a map from a web map stored in ArcGIS.

A web map contains the definition of a map, including properties such as the basemap, initial extent, layers, styles, pop-ups, and labels. You can author and save web maps using the Map Viewer or ArcGIS Pro and share them in ArcGIS. Each web map is stored as an item in ArcGIS Online or ArcGIS Enterprise, allowing you to access a web map from a portal using its item ID and display it in your app.

In this tutorial, you use a web map's item ID to display a map of trails, trailheads and parks in the Santa Monica Mountains . The web map is hosted in ArcGIS Online.

Prerequisites

Steps

Open the 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, get an access token and set the API key.

   Instructions to set the API Key

   An API Key gives your app access to secure resources used in this tutorial.

   1. Go to the Create an API key tutorial to obtain a new API key access token. Ensure that the following privilege is enabled: Location services > Basemaps > Basemap styles service. Copy the access token as it will be used in the next step.

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

   3. In the Editor, set the ArcGISEnvironment.apiKey property on the ArcGISEnvironment with your access token.

      MainApp.swift

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          init() {
              ArcGISEnvironment.apiKey = APIKey("<#YOUR-ACCESS-TOKEN#>")
          }
      

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Get the web map item ID

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

1. Go to the LA Trails and Parks web map in the Map Viewer in ArcGIS Online. This web map displays trails, trailheads and parks in the Santa Monica Mountains.
2. Make a note of the item ID at the end of the browser's URL. The item ID should be

   41281c51f9de45edaf1c8ed44bb10e30

   .

Display the web map

You can create a map from a web map using the web map's item ID. Use the PortalItem class to access the web map and the Map class to create and display a map from it.

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

2. The variable map is not required to be a computed property for this tutorial. Replace it with a Map initializer. You'll update this in the next step.

   ContentView.swift

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   struct ContentView: View {
   
       @State private var map = Map(
   
       )
   
       var body: some View {
   
           MapView(map: map)
   
       }
   
   }

3. Initialize the map with a PortalItem for the web map. To do this, provide a Portal referencing ArcGIS Online and the web map's item ID.

   ContentView.swift

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       @State private var map = Map(
   
           item: PortalItem(
               portal: .arcGISOnline(connection: .anonymous),
               id: PortalItem.ID("41281c51f9de45edaf1c8ed44bb10e30")!
           )
   
       )
   

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   More info

   The Portal object is created using a convenience function that points to ArcGIS Online. This is the equivalent of:

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   Portal(url: URL(string: "https://www.arcgis.com")!, loginRequired: false)

4. Press Command + R to run the app.

   More info

   If you are using the Xcode simulator your system must meet these minimum requirements: macOS Monterey 12.5, Xcode 15, iOS 17. If you are using a physical device, then refer to the system requirements.

You should see a map of trails, trailheads and parks in the Santa Monica Mountains . Pinch, drag, and double-tap the map view to explore the map.

What's next?

Learn how to use additional API features, ArcGIS location services, and ArcGIS tools in these tutorials:

• Display a map
• Add a feature layer