Display a web map

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

display a web map

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

The following are required for this tutorial:

  1. An ArcGIS account to access your API keys. If you don't have an account, sign up for free.
  2. Your system meets the system requirements.

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 project, set your API key.

    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 MainApp.swift.
    3. In the Editor, set the ArcGISEnvironment.apiKey property on the ArcGISEnvironment with your API key.

    MainApp.swift
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    import SwiftUI
    
    import ArcGIS
    
    @main
    struct MainApp: App {
    
        init() {
            ArcGISEnvironment.apiKey = APIKey("<#your-API-key#>")
        }
    
        var body: some SwiftUI.Scene {
            WindowGroup {
                ContentView()
    
                    .ignoresSafeArea()
    
            }
        }
    
    }

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

    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.

    If you are using the Xcode simulator your system must meet these minimum requirements: macOS Big Sur 11.3, Xcode 13.4, iOS 14.0. 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:

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