Display a map

Learn how to create and display a map with a basemap layer.

A map contains layers of geographic data. A map contains a basemap layer and, optionally, one or more data layers. You can display a specific area of a map by using a map view and setting the location and zoom level.

In this tutorial, you create and display a map of the Santa Monica Mountains in California using the topographic basemap layer.

The map and code will be used as the starting point for other 2D tutorials.

Prerequisites

Steps

Create a new Xcode project

Use Xcode to create an iOS app and configure it to reference the API.

1. Open Xcode. In the menu bar, click File > New > Project > iOS > App > Next.

   • In the Choose options window, set the following properties:
     • Product Name: <your app name>
     • Language: Swift
     • Interface: SwiftUI
     • Organization Identifier: <your organization>
   • Uncheck all other options.
   • Click Next.
   • Choose a location to store your project. Click Create.

2. In the Project Navigator, click display_a_mapApp. In the Editor, right click on the struct name, display_a_mapApp. Select Refactor then Rename... to rename the struct to MainApp. Click the Rename button in the top right to confirm the new name. This will rename the struct and file in all affected areas. This file and struct will be named MainApp for all tutorials here on out.

3. Add a reference to the API using Swift Package Manager.

Add a map

Create a map that contains a topographic basemap layer. The map will be centered on the Santa Monica Mountains in California.

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

2. In the Editor, add an import statement to reference the API.

   ContentView.swift

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   import SwiftUI
   
   import ArcGIS
   
   

3. Add a @State property wrapper named map of type Map with a default value. Create a Map with an arcGISTopographic basemap style and return it.

   ContentView.swift

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   struct ContentView: View {
   
       @State private var map = {
           let map = Map(basemapStyle: .arcGISTopographic)
   
           return map
       }()
   
   }
   More info

   A GeoModel like a Map or Scene can be expensive to create and holds state. To ensure that a geo model and other model objects are only created as needed, you can apply the @State or @StateObject property wrapper to them, as in the above code. See Managing model data in your app for more information.

4. Set the map's initialViewpoint property with a Viewpoint using the Santa Monica Mountains coordinates.

   ContentView.swift

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   struct ContentView: View {
   
       @State private var map = {
           let map = Map(basemapStyle: .arcGISTopographic)
   
           map.initialViewpoint = Viewpoint(latitude: 34.02700, longitude: -118.80500, scale: 72_000)
   
           return map
       }()
   
   }

Add a map view

A map view is a UI component that displays a map. It also handles user interactions with the map, including navigating with touch gestures. Use Xcode and SwiftUI to add a map view.

1. In the body, create a MapView with the map created in the previous step.

   ContentView.swift

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   struct ContentView: View {
   
       @State private var map = {
           let map = Map(basemapStyle: .arcGISTopographic)
   
           map.initialViewpoint = Viewpoint(latitude: 34.02700, longitude: -118.80500, scale: 72_000)
   
           return map
       }()
   
       var body: some View {
   
           // Displays the map.
           MapView(map: map)
   
       }
   
   }
   More info

   MapView conforms to the Apple View protocol.

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

3. In the body, add an .ignoresSafeArea() modifier to the ContentView. The ContentView's body contains the MapView and this modifier ensures that the map view is displayed beyond the safe area to all edges.

   MainApp.swift

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       var body: some SwiftUI.Scene {
           WindowGroup {
               ContentView()
   
                   .ignoresSafeArea()
   
           }
       }
   

Set your API key

An API key is required to enable access to services, web maps, and web scenes hosted in ArcGIS Online.

If you haven't already, 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.

1. In the Project Navigator, click MainApp.swift.

2. In the Editor, add an import statement to reference the API.

   MainApp.swift

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   import SwiftUI
   
   import ArcGIS
   
   

3. Implement an initializer in the DisplayAMap struct. 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()
   
           }
       }
   
   }

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 14.0, iOS 16. If you are using a physical device, then refer to the system requirements.

You should see a map with the topographic basemap layer centered on the Santa Monica Mountains in California. 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 web map
• Add a point, line, and polygon