Custom voice controller

import Foundation
import UIKit
import MapboxCoreNavigation
import MapboxNavigation
import MapboxDirections
import AVFoundation
class CustomVoiceControllerUI: UIViewController {
var voiceController: CustomVoiceController?
override func viewDidLoad() {
let origin = CLLocationCoordinate2DMake(37.77440680146262, -122.43539772352648)
let destination = CLLocationCoordinate2DMake(37.76556957793795, -122.42409811526268)
let options = NavigationRouteOptions(coordinates: [origin, destination])
Directions.shared.calculate(options) { (waypoints, routes, error) in
guard let route = routes?.first, error == nil else {
// For demonstration purposes, simulate locations if the Simulate Navigation option is on.
let navigationService = MapboxNavigationService(route: route, simulating: simulationIsEnabled ? .always : .onPoorGPS)
self.voiceController = CustomVoiceController(navigationService: navigationService)
let navigationOptions = NavigationOptions(navigationService: navigationService, voiceController: self.voiceController)
let navigationViewController = NavigationViewController(for: route, options: navigationOptions)
self.present(navigationViewController, animated: true, completion: nil)
override func viewWillDisappear(_ animated: Bool) {
voiceController = nil
class CustomVoiceController: MapboxVoiceController {
// You will need audio files for as many or few cases as you'd like to handle
// This example just covers left, right and straight.
let turnLeft = NSDataAsset(name: "turnleft")!.data
let turnRight = NSDataAsset(name: "turnright")!.data
let straight = NSDataAsset(name: "continuestraight")!.data
override func didPassSpokenInstructionPoint(notification: NSNotification) {
let routeProgress = notification.userInfo![RouteControllerNotificationUserInfoKey.routeProgressKey] as! RouteProgress
let soundForInstruction = audio(for: routeProgress.currentLegProgress.currentStep)
func audio(for step: RouteStep) -> Data {
switch step.maneuverDirection {
case .left:
return turnLeft
case .right:
return turnRight
return straight