Find a route and directions

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 find a route and directions with the ArcGIS routing service. First, you need to set the develop credentials in your app so that your app users can access the ArcGIS routing service.

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.

Update the map

A navigation basemap layer is typically used in routing applications. Update the basemap to use the .arcGISNavigation basemap style, and change the position of the map to center on Los Angeles.

1. Update the Basemap style property from .arcGISTopographic to .arcGISNavigation and update the latitude and longitude coordinates to center on Los Angeles.

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   struct ContentView: View {
   
       @State var map = {
   
           let map = Map(basemapStyle: .arcGISNavigation)
           map.initialViewpoint = Viewpoint(latitude: 34.05293, longitude: -118.24368, scale: 2e5)
   
           return map
       }()
   

2. Create a private class named Model of type ObservableObject and add a @StateObject variable of the Model to the ContentView. See the programming patterns page for more information on how to manage states.

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   import SwiftUI
   
   import ArcGIS
   
   class Model: ObservableObject {
   
   }
   
   struct ContentView: View {
   
       @StateObject private var model = Model()
   
       @State var map = {
   
           let map = Map(basemapStyle: .arcGISNavigation)
           map.initialViewpoint = Viewpoint(latitude: 34.05293, longitude: -118.24368, scale: 2e5)
   
           return map
       }()
   
   }

Add graphics to the map view

A graphics overlay is a container for graphics. Graphics are added as a visual means to display the search result on the map.

1. In the Model class, create a GraphicsOverlay named graphicsOverlay. In the ContentView, add the graphics overlay to the map view.

   More info

   A graphics overlay is a container for graphics. It is used with a map view to display graphics on a map. You can add more than one graphics overlay to a map view. Graphics overlays are displayed on top of all the other layers.

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   import SwiftUI
   
   import ArcGIS
   
   class Model: ObservableObject {
   
       let graphicsOverlay = GraphicsOverlay()
   
   }
   
   struct ContentView: View {
   
       @StateObject private var model = Model()
   
       @State var map = {
   
           let map = Map(basemapStyle: .arcGISNavigation)
           map.initialViewpoint = Viewpoint(latitude: 34.05293, longitude: -118.24368, scale: 2e5)
   
           return map
       }()
   
       var body: some View {
   
           MapView(map: map, graphicsOverlays: [model.graphicsOverlay])
   
       }
   
   }

2. Create a private Graphic property named startGraphic to the Model. Symbolize the graphic with a white circle and black outline. This graphic will be used to display the route's start location.

   More info

   An SimpleMarkerSymbol is used to display a location on the map view.

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   class Model: ObservableObject {
   
       let graphicsOverlay = GraphicsOverlay()
   
       let startGraphic: Graphic = {
           let symbol = SimpleMarkerSymbol(style: .circle, color: .white, size: 8)
           symbol.outline = SimpleLineSymbol(style: .solid, color: .black, width: 1)
           let graphic = Graphic(symbol: symbol)
           return graphic
       }()
   
   }
   

3. Create a private Graphic property named endGraphic. Symbolize the graphic with a black circle. This graphic will be used to display the route's end location.

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   class Model: ObservableObject {
   
       let graphicsOverlay = GraphicsOverlay()
   
       let startGraphic: Graphic = {
           let symbol = SimpleMarkerSymbol(style: .circle, color: .white, size: 8)
           symbol.outline = SimpleLineSymbol(style: .solid, color: .black, width: 1)
           let graphic = Graphic(symbol: symbol)
           return graphic
       }()
   
       let endGraphic: Graphic = {
           let symbol = SimpleMarkerSymbol(style: .circle, color: .black, size: 9)
           let graphic = Graphic(symbol: symbol)
           return graphic
       }()
   
   }
   

4. Create a private Graphic property named routeGraphic. Symbolize the graphic with a blue line. This graphic will be used to display the route line.

   More info

   An SimpleLineSymbol is used to display a line on the map view.

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       let endGraphic: Graphic = {
           let symbol = SimpleMarkerSymbol(style: .circle, color: .black, size: 9)
           let graphic = Graphic(symbol: symbol)
           return graphic
       }()
   
       let routeGraphic: Graphic = {
           let symbol = SimpleLineSymbol(style: .solid, color: .blue, width: 3)
           let graphic = Graphic(symbol: symbol)
           return graphic
       }()
   

5. Create an init() method in the Model that adds startGraphic, endGraphic, and routeGraphic to the graphics overlay. This method will be called when Model is initialized.

   More info

   Because startGraphic, endGraphic, and routeGraphic haven't yet specified a Geometry, they will not be visible.

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       let routeGraphic: Graphic = {
           let symbol = SimpleLineSymbol(style: .solid, color: .blue, width: 3)
           let graphic = Graphic(symbol: symbol)
           return graphic
       }()
   
       init() {
           graphicsOverlay.addGraphics([routeGraphic, startGraphic, endGraphic])
       }
   

Create a route task and route parameters

A task makes a request to a service and returns the results. Use the RouteTask class to access a routing service.

1. Continuing in the Model, create a private RouteTask property named routeTask with the routing service.

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       init() {
           graphicsOverlay.addGraphics([routeGraphic, startGraphic, endGraphic])
       }
   
       private let routeTask = RouteTask(
           url: URL(string: "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World")!
       )
   

2. Create a variable named directions defined as an array of DirectionManeuver objects. This will contain the step by step directions from the start to the end point.

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       private let routeTask = RouteTask(
           url: URL(string: "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World")!
       )
   
       var directions: [DirectionManeuver] = []
   
   

3. Define a private, asynchronous function named solveRoute(start:end:) that takes a start and end Point. This method will be called when both the start and end points have been placed on the map.

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       private let routeTask = RouteTask(
           url: URL(string: "https://route-api.arcgis.com/arcgis/rest/services/World/Route/NAServer/Route_World")!
       )
   
       var directions: [DirectionManeuver] = []
   
       func solveRoute(from start: Point, to end: Point) async throws {
   
       }
   

4. Create default RouteParameters from the routeTask named routeParameters. Configure the parameters by setting two stops (the start and end points) and specify that directions are returned.

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       func solveRoute(from start: Point, to end: Point) async throws {
   
           let routeParameters = try await routeTask.makeDefaultParameters()
           routeParameters.returnsDirections = true
           routeParameters.setStops([Stop(point: start), Stop(point: end)])
   
       }
   

5. Call the solveRoute(using:) function on the routeTask and pass in the routeParameters. To display the solved route, get the first route from the RouteResult and assign its geometry to routeGraphic. To display the directions, assign the directionManeuvers value from the first route to the directions variable.

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       func solveRoute(from start: Point, to end: Point) async throws {
   
           let routeParameters = try await routeTask.makeDefaultParameters()
           routeParameters.returnsDirections = true
           routeParameters.setStops([Stop(point: start), Stop(point: end)])
   
           let routeResult = try await routeTask.solveRoute(using: routeParameters)
           if let firstRoute = routeResult.routes.first {
               routeGraphic.geometry = firstRoute.geometry
               directions = firstRoute.directionManeuvers
           }
   
       }
   

Handle map view touch events

The app will use locations derived from a user tapping the map view to generate the stops on a route. Configure the view to handle touch events from the map view. The locations derived from a user tapping the map view will be used to generate routes in a later step.

1. In the ContentView struct, create two @State private variables of type Point named startPoint and endPoint. These will contain the start and end locations of the route.

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   struct ContentView: View {
   
       @StateObject private var model = Model()
   
       @State private var startPoint: Point?
       @State private var endPoint: Point?
   
       @State var map = {
   
           let map = Map(basemapStyle: .arcGISNavigation)
           map.initialViewpoint = Viewpoint(latitude: 34.05293, longitude: -118.24368, scale: 2e5)
   
           return map
       }()
   
       var body: some View {
   
           MapView(map: map, graphicsOverlays: [model.graphicsOverlay])
   
       }
   
   }

2. Add the onSingleTapGesture method to the map view. If it is the user's first tap, set the startPoint to the current mapPoint. Otherwise, set the endPoint to the current mapPoint. Assign the geometries for startGraphic and endGraphic accordingly.

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       var body: some View {
   
           MapView(map: map, graphicsOverlays: [model.graphicsOverlay])
   
               .onSingleTapGesture { _, mapPoint in
                   if startPoint == nil {
                       startPoint = mapPoint
                       model.startGraphic.geometry = startPoint
                   } else {
                       endPoint = mapPoint
                       model.endGraphic.geometry = endPoint
                   }
               }
   
       }
   

3. Add a .task modifier to the map view with endPoint as an identifier. This task is called if the value of endPoint changes. Ensure that the start and end points are not nil and pass them into the model's solveRoute(start:end:) method. This attempts to solve the route using the start and end points.

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       var body: some View {
   
           MapView(map: map, graphicsOverlays: [model.graphicsOverlay])
   
               .onSingleTapGesture { _, mapPoint in
                   if startPoint == nil {
                       startPoint = mapPoint
                       model.startGraphic.geometry = startPoint
                   } else {
                       endPoint = mapPoint
                       model.endGraphic.geometry = endPoint
                   }
               }
   
               .task(id: endPoint) {
                   guard let startPoint = startPoint, let endPoint = endPoint else { return }
                   do {
                       try await model.solveRoute(from: startPoint, to: endPoint)
                   } catch {
                       print(error)
                   }
               }
   
       }
   

Add a UI to display driving directions

To display the turn-by-turn directions from the route, some UI element is required.

1. In the ContentView struct, add a Bool variable named isShowingDirections to indicate if the directions are shown or not. Set its initial value to false.

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   struct ContentView: View {
   
       @StateObject private var model = Model()
   
       @State private var isShowingDirections = false
   
       @State private var startPoint: Point?
       @State private var endPoint: Point?
   
       @State var map = {
   
           let map = Map(basemapStyle: .arcGISNavigation)
           map.initialViewpoint = Viewpoint(latitude: 34.05293, longitude: -118.24368, scale: 2e5)
   
           return map
       }()
   

2. Add a .toolbar and ToolbarItemGroup to the bottom of the map view.

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       var body: some View {
   
           MapView(map: map, graphicsOverlays: [model.graphicsOverlay])
   
               .onSingleTapGesture { _, mapPoint in
                   if startPoint == nil {
                       startPoint = mapPoint
                       model.startGraphic.geometry = startPoint
                   } else {
                       endPoint = mapPoint
                       model.endGraphic.geometry = endPoint
                   }
               }
   
               .task(id: endPoint) {
                   guard let startPoint = startPoint, let endPoint = endPoint else { return }
                   do {
                       try await model.solveRoute(from: startPoint, to: endPoint)
                   } catch {
                       print(error)
                   }
               }
   
               .toolbar {
                   ToolbarItemGroup(placement: .bottomBar) {
   
                   }
               }
   
       }
   

3. Add a Button, labeled "Show directions", to the toolbar. This button indicates that the user wants to show the directions so toggle the isShowingDirections value to true.

   ContentView.swift

   Use dark colors for code blocks

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   Add line.Add line.Add line.

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               .toolbar {
                   ToolbarItemGroup(placement: .bottomBar) {
   
                       Button("Show directions") {
                           isShowingDirections = true
                       }
   
                   }
               }
   

4. Add a .popover with a NavigationView to the toolbar. Set the popover's isPresented parameter to isShowingDirections. The popover will display according to the isShowingDirections value. Customize the navigation view.

   ContentView.swift

   Use dark colors for code blocks

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   Add line.Add line.Add line.Add line.Add line.Add line.Add line.

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               .toolbar {
                   ToolbarItemGroup(placement: .bottomBar) {
   
                       Button("Show directions") {
                           isShowingDirections = true
                       }
   
                       .popover(isPresented: $isShowingDirections) {
                           NavigationView {
   
                           }
                           .navigationViewStyle(.stack)
                           .frame(idealWidth: 320, idealHeight: 428)
                       }
   
                   }
               }
   

5. Within the NavigationView content, create a List with directions which contains an array of DirectionManeuver objects. Configure the navigation view with a title, display mode, and "Done" button. When the button is tapped, isShowingDirections is set to false which closes the popover.

   ContentView.swift

   Use dark colors for code blocks

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   Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.Add line.

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                       .popover(isPresented: $isShowingDirections) {
                           NavigationView {
   
                               List(model.directions, id: \.text) { directionManeuver in
                                   Text(directionManeuver.text)
                               }
                               .navigationTitle("Directions")
                               .navigationBarTitleDisplayMode(.inline)
                               .toolbar {
                                   ToolbarItem(placement: .confirmationAction) {
                                       Button("Done") {
                                           isShowingDirections = false
                                       }
                                   }
                               }
   
                           }
                           .navigationViewStyle(.stack)
                           .frame(idealWidth: 320, idealHeight: 428)
                       }
   

Run the solution

Press Command + R to run the app.

The map should support two taps to create an origin and destination point and then use the ArcGIS routing service to display the resulting route.

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 add the developer credentials that you created in the set up authentication section.

Set developer credentials in the solution

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.