public protocol NavigationRouteTrackingStateUpdateObserver : Observer
An observer to receive route tracking state updates.
The information about the route state is represented by
When the driver deviates or returns to the active route, the navigation engine sends route-tracking state updates to the observer.
To start receiving route tracking state updates, become an observer using
To stop receiving route tracking state updates, remove the previously added observer using
ImportantThis is a Public Preview API. It may be changed or removed at any time.
Reports that the driver is following the route or has deviated from the active route.
func onRouteTrackingStateUpdate(routeTrackingState: RouteTrackingState)
The current route tracking state.