open class RouteVoiceController : NSObject, AVSpeechSynthesizerDelegate
A route voice controller plays spoken instructions as audio using the Speech Synthesis framework, also known as VoiceOver.
You initialize a voice controller using a
NavigationService instance. The voice controller observes when the navigation service hints that the user has passed a spoken instruction point and responds by reading aloud the contents of a
SpokenInstruction object using an
The Speech Synthesis framework does not require a network connection, but the speech quality may be limited in some languages including English. By default, a
NavigationViewController plays spoken instruction susing a subclass,
MapboxVoiceController, that is powered by the MapboxSpeech framework instead of the Speech Synthesis framework.
If you need to supply a third-party speech synthesizer, define a subclass of
RouteVoiceController that overrides the
speak(_:) method. If the third-party speech synthesizer requires a network connection, you can instead subclass
MapboxVoiceController to take advantage of its prefetching functionality.
If true, a noise indicating the user is going to be rerouted will play prior to rerouting.
public var playRerouteSound: Bool
Sound to play prior to reroute. Inherits volume level from
public var rerouteSoundPlayer: AVAudioPlayer