Add a feature layer
Learn how to use a URL to access and display a feature layer in a map.
A map contains layers of geographic data. A map contains a basemap layer and, optionally, one or more data layers. This tutorial shows you how to access and display a feature layer in a map. You access feature layers with an item ID or URL. You will use URLs to access the Trailheads, Trails, and Parks and Open Spaces feature layers and display them in a map.
Prerequisites
The following are required for this tutorial:
- An ArcGIS account to access your API keys. If you don't have an account, sign up for free.
- Your system meets the system requirements.
Steps
Open the Xcode project
To start the tutorial, complete the Display a map tutorial or download and unzip the solution.
Open the
.xcodeproj
file in Xcode.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.
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.
- In Xcode, in the Project Navigator, click MainApp.swift.
- In the Editor, set the
ArcGISEnvironment.apiKey
property on theArcGISEnvironment
with your API key.
MainApp.swiftUse dark colors for code blocks Change line Change line Change line
Add a feature layer to the map
In the project navigator, open the ContentView.swift file. Update the
map
object. Create aService
to access the trail heads data and aFeature Table Feature
to view it. Add the layer to the map's operational layers.Layer A
Service
is effectively an in-memory database of the features from a service URL.Feature Table A
Feature
andLayer Service
work together to request, cache locally, and display features on a map.Feature Table Operational layers are map layers that users can interact with and appear overlaid on top of the basemap.
ContentView.swiftUse dark colors for code blocks Add line. Add line. Add line. Add line. Press <Command+R> to run the app.
If you are using the Xcode simulator your system must meet these minimum requirements: macOS Monterey 12.5, Xcode 14.1, iOS 16. If you are using a physical device, then refer to the system requirements.
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.