GuidanceUpdateObserver

public protocol GuidanceUpdateObserver : Observer

Informs the caller about announcements and instructions update events.

The method TomTomSDKNavigationEngines.GuidanceEngine.generateGuidance(navigationSnapshot:) generates the guidance with instructions and distance. Based on the guidance result, the methods of the observers are called.

The protocol provides the interface for handling several events like changes in instructions, generation of announcements, and changes in distance to the next instruction.

To observe the guidance changes, first implement this interface to create an observer, for example:

class CustomGuidanceUpdateObserver: GuidanceUpdateObserver {

    func didChangeInstructions(instructions: [GuidanceInstruction]) {
        // Add code here that handles the changes of instructions.
    }

    func didGenerateAnnouncement(announcement: GuidanceAnnouncement, shouldPlay: Bool) {
        // Add code here that handles a new generate announcement.
    }

    func didChangeDistanceToNextInstruction(
        distance: Measurement<UnitLength>,
        instructions: [GuidanceInstruction],
        currentPhase: InstructionPhase
    ) {
        // Add code here that handles a change of distance to new instruction.
    }
}

Then add the observer using addGuidanceUpdateObserver(_:). To stop observation of the guidance changes, remove the observer using removeGuidanceUpdateObserver(_:).