On-demand Rides and Deliveries Solution is currently available only to select partners.

Getting started with the Consumer SDK for iOS

You can use the Consumer SDK to build and run a basic consumer app integrated with On-demand Rides and Deliveries Solution backend services. You can create a Trip and Order Progress app that can display an active trip, respond to trip updates, and handle trip errors.

Because the Consumer SDK has a modular architecture, you can use the parts of the API that you want to use for your particular app and integrate them with your own APIs, backend services provided by the Fleet Engine, and additional APIs of the Google Maps Platform.

Minimum system requirements

  • The mobile device must be running iOS 13 or later.
  • Xcode version 14 or later.
  • Project configuration

    You can configure the Consumer SDK by using CocoaPods.

    Use CocoaPods

    To configure the Consumer SDK using CocoaPods, you need the following items:

    • The CocoaPods tool: To install this tool, open the Terminal and run the following command. shell sudo gem install cocoapods Refer to the CocoaPods Getting Started guide for more details.
    1. Create a Podfile for the Consumer SDK and use it to install the API and its dependencies. First, create a file named Podfile in your project directory. This file defines your project's dependencies. Then edit the Podfile and add your dependencies. Here is an example which includes the dependencies:

      source "https://github.com/CocoaPods/Specs.git"
      
      target 'YOUR_APPLICATION_TARGET_NAME_HERE' do
        pod 'GoogleRidesharingConsumer'
      end
      
    2. Save the Podfile. Open a terminal and go to the directory containing the Podfile:

      cd <path-to-project>
      
    3. Run the pod install command. This will install the APIs specified in the Podfile, along with any dependencies they may have.

      pod install
      
    4. Close Xcode and then open (double-click) your project's .xcworkspace file to launch Xcode. To open the project later, use the .xcworkspace file.

    Install the XCFramework

    An XCFramework is a binary package that you use to install the Consumer SDK. You can use this package on multiple platforms, including machines using the M1 chipset. This guide shows how to manually add the XCFramework containing the Consumer SDK to your project and configure your build settings in Xcode.

    1. Unpack the source files that you received from Google.

    2. Start Xcode and either open an existing project, or create a new project. If you're new to iOS, create a new project and select the iOS App template.

    3. Create a Frameworks group under your project group if one does not exist already.

    4. Drag the gRPCCertificates.bundle file included in the Resources directory of the zip containing the XCFramework into the top level directory of your Xcode project. When prompted, select Copy items if needed.

    5. To install the Consumer SDK, drag the GoogleRidesharingConsumer.xcframework file into your project under Frameworks, Libraries, and Embedded Content. When prompted, select Copy items if needed.

    6. Select your project from the Project Navigator, and choose your application's target.

    7. Open the Build Phases tab, and in Link Binary with Libraries, add the following frameworks and libraries if they are not already present:

      • Accelerate.framework
      • CoreData.framework
      • CoreGraphics.framework
      • CoreImage.framework
      • CoreLocation.framework
      • CoreTelephony.framework
      • CoreText.framework
      • GLKit.framework
      • ImageIO.framework
      • libc++.tbd
      • libz.tbd
      • Metal.framework
      • OpenGLES.framework
      • QuartzCore.framework
      • SystemConfiguration.framework
      • UIKit.framework
    8. Choose your project, rather than a specific target, and open the Build Settings tab. In the Other Linker Flags section, add ‑ObjC for both debug and release. If these settings are not visible, change the filter in the Build Settings bar from Basic to All.

    Alpha/Beta SDK versions

    To configure the Alpha or Beta versions of the Consumer SDK using CocoaPods for iOS you need the following items:

    • The CocoaPods tool: To install this tool, open the Terminal and run the following command.

      sudo gem install cocoapods
      

      Refer to the CocoaPods Getting Started guide for more details.

    • Your development account on the Google access list. The pod repository of the Alpha and Beta versions of the SDK are not public source. To access those versions, contact the Google Customer Engineer. The engineer adds your development account to the access list and then sets a cookie for authentication.

    After your project is on the access list, you can access the pod.

    1. Create a Podfile for the Consumer SDK for iOS and use it to install the API and its dependencies: Create a file named Podfile in your project directory. This file defines your project's dependencies. Edit the Podfile and add your dependencies. Here is an example which includes the dependencies:

      source "https://cpdc-eap.googlesource.com/ridesharing-consumer-sdk"
      source "https://github.com/CocoaPods/Specs.git"
      
      target 'YOUR_APPLICATION_TARGET_NAME_HERE' do
        pod 'GoogleRidesharingConsumer'
      end
      
    2. Save the Podfile. Open a terminal and go to the directory containing the Podfile:

      cd <path-to-project>
      
    3. Run the pod install command. This will install the APIs specified in the Podfile, along with any dependencies they may have.

      pod install
      
    4. Close Xcode, and then open (double-click) your project's .xcworkspace file to launch Xcode. From this time onwards, you must use the .xcworkspace file to open the project.

    Application integration

    Provide authentication token

    When your Consumer app requests trip updates from Fleet Engine, the requests must include valid access tokens. To authorize and authenticate these requests, the Consumer SDK calls your object conforming to the GMTCAuthorization protocol. The object is responsible for providing the required access token.

    As the app developer, you choose how tokens are generated. Your implementation should provide the ability to do the following:

    • Fetch an access token, possibly in JSON format, from an HTTPS server.
    • Parse and cache the token.
    • Refresh the token when it expires.

    For details of the tokens expected by the Fleet Engine server, see Creating a JSON Web Token (JWT) for authorization.

    The provider ID is the same as Google Cloud Project ID. For more information, see Getting Started with Fleet Engine.

    The following example implements an access token provider:

    Swift

    /*
     * SampleAccessTokenProvider.swift
     */
    import GoogleRidesharingConsumer
    
    private let providerURL = "INSERT_YOUR_TOKEN_PROVIDER_URL"
    
    class SampleAccessTokenProvider: NSObject, GMTCAuthorization {
      private struct AuthToken {
        // The cached trip token.
        let token: String
        // Keep track of when the token expires for caching.
        let expiration: TimeInterval
        // Keep track of the trip ID the cached token is for.
        let tripID: String
      }
    
      enum AccessTokenError: Error {
        case missingAuthorizationContext
        case missingData
      }
    
      private var authToken: AuthToken?
    
      func fetchToken(
        with authorizationContext: GMTCAuthorizationContext?,
        completion: @escaping GMTCAuthTokenFetchCompletionHandler
      ) {
        // Get the trip ID from the authorizationContext. This is set by the Consumer SDK.
        guard let authorizationContext = authorizationContext else {
          completion(nil, AccessTokenError.missingAuthorizationContext)
          return
        }
        let tripID = authorizationContext.tripID
    
        // If appropriate, use the cached token.
        if let authToken = authToken,
          authToken.expiration > Date.now.timeIntervalSince1970 && authToken.tripID == tripID
        {
          completion(authToken.token, nil)
          return
        }
    
        // Otherwise, try to fetch a new token from your server.
        let request = URLRequest(url: URL(string: providerURL))
        let task = URLSession.shared.dataTask(with: request) { [weak self] data, _, error in
          guard let strongSelf = self else { return }
          guard error == nil else {
            completion(nil, error)
            return
          }
    
          // Replace the following key values with the appropriate keys based on your
          // server's expected response.
          let tripTokenKey = "TRIP_TOKEN_KEY"
          let tokenExpirationKey = "TOKEN_EXPIRATION"
          guard let data = data,
            let fetchData = try? JSONSerialization.jsonObject(with: data) as? [String: Any],
            let token = fetchData[tripTokenKey] as? String,
            let expiration = fetchData[tokenExpirationKey] as? Double
          else {
            completion(nil, AccessTokenError.missingData)
            return
          }
    
          strongSelf.authToken = AuthToken(token: token, expiration: expiration, tripID: tripID)
          completion(token, nil)
        }
        task.resume()
      }
    }
    

    Objective-C

    /*
     * SampleAccessTokenProvider.h
     */
    #import <Foundation/Foundation.h>
    #import <GoogleRidesharingConsumer/GoogleRidesharingConsumer.h>
    
    NS_ASSUME_NONNULL_BEGIN
    
    @interface SampleAccessTokenProvider : NSObject <GMTCAuthorization>
    
    @end
    
    NS_ASSUME_NONNULL_END
    
    /*
     * SampleAccessTokenProvider.m
     */
    #import "SampleAccessTokenProvider.h"
    #import "GoogleRidesharingConsumer/GoogleRidesharingConsumer.h"
    
    static NSString *const PROVIDER_URL = @"INSERT_YOUR_TOKEN_PROVIDER_URL";
    
    // SampleAccessTokenProvider.m
    @implementation SampleAccessTokenProvider {
      // The cached token with claims to the current trip.
      NSString *_cachedTripToken;
      // Keep track of the Trip ID the cached token is for.
      NSString *_lastKnownTripID;
      // Keep track of when tokens expire for caching.
      NSTimeInterval _tokenExpiration;
    }
    
    - (void)fetchTokenWithContext:(nullable GMTCAuthorizationContext *)authorizationContext
                       completion:(nonnull GMTCAuthTokenFetchCompletionHandler)completion {
      // Get the trip ID from the authorizationContext. This is set by the Consumer SDK.
      NSString *tripID = authorizationContext.tripID;
    
      // Clear cached trip token if trip ID has changed.
      if (![_lastKnownTripID isEqual:tripID]) {
        _tokenExpiration = 0.0;
        _cachedTripToken = nil;
      }
      _lastKnownTripID = tripID;
    
      // Clear cached tripToken if it has expired.
      if ([[NSDate date] timeIntervalSince1970] > _tokenExpiration) {
        _cachedTripToken = nil;
      }
    
      // If appropriate, use the cached token.
      if (_cachedTripToken) {
        completion(_cachedTripToken, nil);
        return;
      }
      // Otherwise, try to fetch a new token from your server.
      NSURL *requestURL = [NSURL URLWithString:PROVIDER_URL];
      NSMutableURLRequest *request =
          [[NSMutableURLRequest alloc] initWithURL:requestURL];
      request.HTTPMethod = @"GET";
    
      // Replace the following key values with the appropriate keys based on your
      // server's expected response.
      NSString *tripTokenKey = @"TRIP_TOKEN_KEY";
      NSString *tokenExpirationKey = @"TOKEN_EXPIRATION";
    
      __weak typeof(self) weakSelf = self;
      void (^handler)(NSData *_Nullable data, NSURLResponse *_Nullable response,
                      NSError *_Nullable error) =
          ^(NSData *_Nullable data, NSURLResponse *_Nullable response, NSError *_Nullable error) {
            typeof(self) strongSelf = weakSelf;
            if (error) {
              completion(nil, error);
              return;
            }
    
            NSError *JSONError;
            NSMutableDictionary *JSONResponse =
                [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&JSONError];
    
            if (JSONError) {
              completion(nil, JSONError);
              return;
            } else {
              // Sample code only. No validation logic.
              id expirationData = JSONResponse[tokenExpirationKey];
              if ([expirationData isKindOfClass:[NSNumber class]]) {
                NSTimeInterval expirationTime = ((NSNumber *)expirationData).doubleValue;
                strongSelf->_tokenExpiration = [[NSDate date] timeIntervalSince1970] + expirationTime;
              }
              strongSelf->_cachedTripToken = JSONResponse[tripTokenKey];
              completion(JSONResponse[tripTokenKey], nil);
            }
          };
      NSURLSessionConfiguration *config = [NSURLSessionConfiguration defaultSessionConfiguration];
      NSURLSession *mainQueueURLSession =
          [NSURLSession sessionWithConfiguration:config delegate:nil
                                   delegateQueue:[NSOperationQueue mainQueue]];
      NSURLSessionDataTask *task = [mainQueueURLSession dataTaskWithRequest:request completionHandler:handler];
      [task resume];
    }
    
    @end
    

    Application initialization

    Swift

    /*
     * AppDelegate.swift
     */
    import GoogleRidesharingConsumer
    import GoogleMaps
    
    @UIApplicationMain
    class AppDelegate: UIResponder, UIApplicationDelegate {
    
      func application(_ application: UIApplication,
          didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        // Register your API key for GMSServices.
        GMSServices.provideAPIKey(yourMapsAPIKey)
    
        // Set the instance of the SampleAccessTokenProvider.
        GMTCServices.setAccessTokenProvider(SampleAccessTokenProvider(), providerID: yourProviderID)
    
        // Other initialization code ...
        return true
      }
    }
    

    Objective-C

    /*
     * AppDelegate.m
     */
    #import <GoogleMaps/GoogleMaps.h>
    #import <GoogleRidesharingConsumer/GoogleRidesharingConsumer.h>
    
    @implementation AppDelegate
    
    - (BOOL)application:(UIApplication *)application
        didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
      //Register your API key for GMSServices.
      [GMSServices provideAPIKey:yourMapsAPIKey];
    
      //Set the instance of the AccessTokenFactory.
      [GMTCServices setAccessTokenProvider:[[SampleAccessTokenProvider alloc] init]
                                providerID:yourProviderID];
    
      // Other initialization code ...
      return YES;
    }
    
    @end
    

    Map view integration

    Initialize the map view

    The following example shows how to initialize GMTCMapView.

    Swift

    /*
     * MapViewController.swift
     */
    class ViewController: UIViewController, GMTCMapViewDelegate {
      private var rideSharingMap: GMTCMapView?
    
      override func viewDidLoad() {
        super.viewDidLoad()
    
        self.rideSharingMap = GMTCMapView(frame: UIScreen.main.bounds)
        self.rideSharingMap.delegate = self
        self.rideSharingMap?.settings.myLocationButton = true
        self.view.addSubview(self.rideSharingMap!)
        ...
      }
    

    Objective-C

    /*
     * MapViewController.h
     */
    @interface MapViewController : UIViewController<GMTCMapViewDelegate>
    ...
    @end
    
    /*
     * MapViewController.m
     */
    @implementation MapViewController
    
    - (void)viewDidLoad {
      [super viewDidLoad];
      ...
      self.mapView = [[GMTCMapView alloc] init];
      self.mapView.settings.myLocationButton = YES;
      self.mapView.delegate = self;
      ...
    }
    
    ...
    
    @end
    

    Handle map view events

    The following example shows how to implement a delegate to handle customer state events.

    Swift

    func mapViewDidInitialize(_ mapview: GMTCMapView) {
      // Handle the update to the state of the map view to browsing.
    }
    
    func mapView(_ mapView: GMSMapView, didTapConsumerMarker mapMarker: GMSMarker, markerType: GMTCMapViewMarkerType) -> Bool {
      // Handle the mapView marker was tapped.
    }
    

    Objective-C

    /*
     * MapViewController.m
     */
    #pragma mark - GMTCMapViewDelegate implementation
    
    // Handle state update of map view.
    - (void)mapViewDidInitializeCustomerState:(GMTCMapView *)mapview {
      // Handle the update to the state of the map view to browsing.
    }
    
    - (void)mapView:(GMSMapView *)mapView
        didTapConsumerMarker:(nonnull GMSMarker *)mapMarker
                  markerType:(GMTCMapViewMarkerType)markerType {
      // Handle the mapView marker was tapped.
    }
    

    Journey sharing

    Start a new trip when view did load

    The following example shows how to start a journey sharing immediately after the view loads. You can gather all user inputs such as drop off and pickup locations from a ViewController, and then create a new ViewController to start the journey sharing directly.

    Swift

    /*
     * MapViewController.swift
     */
    override func viewDidLoad() {
      super.viewDidLoad()
      ...
      self.mapView = GMTCMapView(frame: UIScreen.main.bounds)
      self.mapView.delegate = self
      self.view.addSubview(self.mapView)
    }
    
    func mapViewDidInitializeCustomerState(_: GMTCMapView) {
      self.mapView.pickupLocation = self.selectedPickupLocation
      self.mapView.dropoffLocation = self.selectedDropoffLocation
    
      self.startConsumerMatchWithLocations(
        pickupLocation: self.mapView.pickupLocation!,
        dropoffLocation: self.mapView.dropoffLocation!
      ) { [weak self] (tripName, error) in
        guard let strongSelf = self else { return }
        if error != nil {
          // print error message.
          return
        }
        let tripService = GMTCServices.shared().tripService
        // Create a tripModel instance for listening the update of the trip
        // specified by this trip name.
        let tripModel = tripService.tripModel(forTripName: tripName)
        // Create a journeySharingSession instance based on the tripModel
        let journeySharingSession = GMTCJourneySharingSession(tripModel: tripModel)
        // Add the journeySharingSession instance on the mapView for UI updating.
        strongSelf.mapView.show(journeySharingSession)
        // Register for the trip update events.
        tripModel.register(strongSelf)
    
        strongSelf.currentTripModel = tripModel
        strongSelf.currentJourneySharingSession = journeySharingSession
        strongSelf.hideLoadingView()
      }
    
      self.showLoadingView()
    }
    

    Objective-C

    /*
     * MapViewController.m
     */
    - (void)viewDidLoad {
      [super viewDidLoad];
      ...
      self.mapView = [[GMTCMapView alloc] init];
      self.mapView.delegate = self;
      [self.view addSubview:self.mapView];
    }
    
    // Handle the callback when the GMTCMapView did initialized.
    - (void)mapViewDidInitializeCustomerState:(GMTCMapView *)mapview {
      self.mapView.pickupLocation = self.selectedPickupLocation;
      self.mapView.dropoffLocation = self.selectedDropoffLocation;
    
      __weak __typeof(self) weakSelf = self;
      [self startTripBookingWithPickupLocation:self.selectedPickupLocation
                               dropoffLocation:self.selectedDropoffLocation
                                    completion:^(NSString *tripName, NSError *error) {
                                      __typeof(self) strongSelf = weakSelf;
                                      GMTCTripService *tripService = [GMTCServices sharedServices].tripService;
                                      // Create a tripModel instance for listening to updates to the trip specified by this trip name.
                                      GMTCTripModel *tripModel = [tripService tripModelForTripName:tripName];
                                      // Create a journeySharingSession instance based on the tripModel.
                                      GMTCJourneySharingSession *journeySharingSession =
                                        [[GMTCJourneySharingSession alloc] initWithTripModel:tripModel];
                                      // Add the journeySharingSession instance on the mapView for updating the UI.
                                      [strongSelf.mapView showMapViewSession:journeySharingSession];
                                      // Register for trip update events.
                                      [tripModel registerSubscriber:self];
    
                                      strongSelf.currentTripModel = tripModel;
                                      strongSelf.currentJourneySharingSession = journeySharingSession;
                                      [strongSelf hideLoadingView];
                                    }];
        [self showLoadingView];
    }
    

    Cancel the active trip

    The following example shows how to reset the current active trip.

    Swift

    /*
     * MapViewController.swift
     */
    func cancelCurrentActiveTrip() {
      // Stop the tripModel
      self.currentTripModel.unregisterSubscriber(self)
    
      // Remove the journey sharing session from the mapView's UI stack.
      self.mapView.hide(journeySharingSession)
    }
    

    Objective-C

    /*
     * MapViewController.m
     */
    - (void)cancelCurrentActiveTrip {
      // Stop the tripModel
      [self.currentTripModel unregisterSubscriber:self];
    
      // Remove the journey sharing session from the mapView's UI stack.
      [self.mapView hideMapViewSession:journeySharingSession];
    }
    

    Listen for trip updates

    The following example shows how to register the tripModel callback.

    Swift

    /*
     * MapViewController.swift
     */
    override func viewDidLoad() {
      super.viewDidLoad()
      // Register for trip update events.
      self.currentTripModel.register(self)
    }
    

    Objective-C

    /*
     * MapViewController.m
     */
    - (void)viewDidLoad {
      [super viewDidLoad];
      // Register for trip update events.
      [self.currentTripModel registerSubscriber:self];
      ...
    }
    

    The following example shows how to cancel registration of the tripModel callback.

    Swift

    /*
     * MapViewController.swift
     */
    deinit {
      self.currentTripModel.unregisterSubscriber(self)
    }
    

    Objective-C

    /*
     * MapViewController.m
     */
    - (void)dealloc {
      [self.currentTripModel unregisterSubscriber:self];
      ...
    }
    

    The following example shows how to implement the GMTCTripModelSubscriber protocol for handling callbacks when the trip state is updated.

    Swift

    /*
     * MapViewController.swift
     */
    func tripModel(_: GMTCTripModel, didUpdate trip: GMTSTrip?, updatedPropertyFields: GMTSTripPropertyFields) {
      // Update the UI with the new `trip` data.
      self.updateUI(with: trip)
    }
    
    func tripModel(_: GMTCTripModel, didUpdate tripStatus: GMTSTripStatus) {
      // Handle trip status did change.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateActiveRouteRemainingDistance activeRouteRemainingDistance: Int32) {
      // Handle remaining distance of active route did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateActiveRoute activeRoute: [GMTSLatLng]?) {
      // Handle trip active route did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdate vehicleLocation: GMTSVehicleLocation?) {
      // Handle vehicle location did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdatePickupLocation pickupLocation: GMTSTerminalLocation?) {
      // Handle pickup location did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateDropoffLocation dropoffLocation: GMTSTerminalLocation?) {
      // Handle drop off location did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdatePickupETA pickupETA: TimeInterval) {
      // Handle the pickup ETA did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateDropoffETA dropoffETA: TimeInterval) {
      // Handle the drop off ETA did update.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateRemaining remainingWaypoints: [GMTSTripWaypoint]?) {
      // Handle updates to the pickup, dropoff or intermediate destinations of the trip.
    }
    
    func tripModel(_: GMTCTripModel, didFailUpdateTripWithError error: Error?) {
      // Handle the error.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateIntermediateDestinations intermediateDestinations: [GMTSTerminalLocation]?) {
      // Handle the intermediate destinations being updated.
    }
    
    func tripModel(_: GMTCTripModel, didUpdateActiveRouteTraffic activeRouteTraffic: GMTSTrafficData?) {
      // Handle trip active route traffic being updated.
    }
    

    Objective-C

    /*
     * MapViewController.m
     */
    #pragma mark - GMTCTripModelSubscriber implementation
    
    - (void)tripModel:(GMTCTripModel *)tripModel
                didUpdateTrip:(nullable GMTSTrip *)trip
        updatedPropertyFields:(enum GMTSTripPropertyFields)updatedPropertyFields {
      // Update the UI with the new `trip` data.
      [self updateUIWithTrip:trip];
      ...
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel didUpdateTripStatus:(enum GMTSTripStatus)tripStatus {
      // Handle trip status did change.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateActiveRouteRemainingDistance:(int32_t)activeRouteRemainingDistance {
       // Handle remaining distance of active route did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateActiveRoute:(nullable NSArray<GMTSLatLng *> *)activeRoute {
      // Handle trip active route did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateVehicleLocation:(nullable GMTSVehicleLocation *)vehicleLocation {
      // Handle vehicle location did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdatePickupLocation:(nullable GMTSTerminalLocation *)pickupLocation {
      // Handle pickup location did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateDropoffLocation:(nullable GMTSTerminalLocation *)dropoffLocation {
      // Handle drop off location did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel didUpdatePickupETA:(NSTimeInterval)pickupETA {
      // Handle the pickup ETA did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateRemainingWaypoints:(nullable NSArray<GMTSTripWaypoint *> *)remainingWaypoints {
      // Handle updates to the pickup, dropoff or intermediate destinations of the trip.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel didUpdateDropoffETA:(NSTimeInterval)dropoffETA {
      // Handle the drop off ETA did update.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel didFailUpdateTripWithError:(nullable NSError *)error {
      // Handle the error.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateIntermediateDestinations:
            (nullable NSArray<GMTSTerminalLocation *> *)intermediateDestinations {
      // Handle the intermediate destinations being updated.
    }
    
    - (void)tripModel:(GMTCTripModel *)tripModel
        didUpdateActiveRouteTraffic:(nullable GMTSTrafficData *)activeRouteTraffic {
      // Handle trip active route traffic being updated.
    }
    

    Error handling

    If you subscribed the tripModel and an error occurs, you can get the callback of tripModel by implementing the delegate method tripModel(_:didFailUpdateTripWithError:). Fleet Engine generated the error message which follows the Google Cloud Error standard. For the detail error message definition and all the error codes please refer to Google Cloud Errors documentation.

    Specifically, for trip monitoring, it requires providing a valid authentication token. 401 UNAUTHENTICATED will be raised if there is no valid authentication credentials, like token is expired.403 PERMISSION_DENIED will be raised if the caller has no permission to call a specific api (for example, user with consumer role tries to call updateTrip), or the request has no valid vehicle_id/trip_id in JWT token.

    For more information, see Consumer SDK Error Handling.

    UI Customization

    Get/Set custom polyline UI options

    The following example shows how to set custom UI options for polylines.

    Swift

    /** MapViewController.swift */
    
    func updatePolylineUIOptions() {
      // The polyline type that you would like to set custom UI options for.
      let customizablePolylineType = GMTCPolylineType.activeRoute
    
      let polylineStyleOptions = GMTCMutablePolylineStyleOptions()
      polylineStyleOptions.strokeWidth = 8.0
      polylineStyleOptions.strokeColor = .blue
      polylineStyleOptions.isVisible = true
      polylineStyleOptions.zIndex = 1000
      polylineStyleOptions.isGeodesic = true
      let coordinator = self.mapView.consumerMapStyleCoordinator
      coordinator.setPolylineStyleOptions(polylineStyleOptions, polylineType:customizablePolylineType)
    }
    

    Objective-C

    /** MapViewController.m */
    
    - (void)updatePolylineUIOptions {
      // The polyline type that you would like to set custom UI options for.
      GMTCPolylineType customizablePolylineType = GMTCPolylineTypeActiveRoute;
    
      GMTCMutablePolylineStyleOptions *polylineStyleOptions =
          [[GMTCMutablePolylineStyleOptions alloc] init];
      polylineStyleOptions.strokeWidth = 8.0;
      polylineStyleOptions.strokeColor = [UIColor blueColor];
      polylineStyleOptions.isVisible = YES;
      polylineStyleOptions.zIndex = 1000;
      polylineStyleOptions.isGeodesic = YES;
      [[_mapView consumerMapStyleCoordinator] setPolylineStyleOptions:polylineStyleOptions
                                                    polylineType:customizablePolylineType];
    }
    

    Get/Set custom marker UI options

    The following example shows how to set custom UI options for markers.

    Swift

    /** MapViewController.swift */
    
    func updateMarkerUIOptions() {
      let customizableMarkerType = GMTCCustomizableMarkerType.tripVehicle
      let markerStyleOptions = GMTCMutableMarkerStyleOptions()
      markerStyleOptions.groundAnchor = groundAnchor
      markerStyleOptions.isVisible = true
      markerStyleOptions.icon = icon
      markerStyleOptions.zIndex = 100
      markerStyleOptions.isFlat = false
      let coordinator = self.mapView.consumerMapStyleCoordinator
      coordinator.setMarkerStyleOptions(markerStyleOptions, markerType: customizableMarkerType)
    }
    

    Objective-C

    /** MapViewController.m */
    
    - (void)updateMarkerUIOptions {
      // The marker type that you would like to set custom UI options for.
      GMTCCustomizableMarkerType customizableMarkerType = GMTCCustomizableMarkerTypeTripVehicle;
    
      GMTCMutableMarkerStyleOptions *markerStyleOptions =
          [[GMTCMutableMarkerStyleOptions alloc] init];
      markerStyleOptions.groundAnchor = groundAnchor;
      markerStyleOptions.isVisible = YES;
      markerStyleOptions.icon = icon;
      markerStyleOptions.zIndex = 100;
      markerStyleOptions.isFlat = NO;
    
      [[_mapView consumerMapStyleCoordinator] setMarkerStyleOptions:markerStyleOptions markerType:customizableMarkerType];
    }
    

    Adjusting the camera zoom

    The My Location button in the Maps SDK for iOS centers the camera on the device location.

    If there is an active Journey Sharing session, you can center the camera to focus on the journey instead of only on the device location.

    The Consumer SDK provides an auto camera feature that is enabled by default. The camera zooms to focus on the journey sharing route and the next trip waypoint.

    AutoCamera

    If you require more control of the camera behavior, you can disable or enable the auto camera feature using the isAllowCameraAutoUpdate property.

    For more camera customizations, see Maps SDK for iOS Moving the camera.