Carplay Resume Music

Question

I am creating a CarPlay music app, everything works fine except when I get a call in between my music is playing. Carplay pauses music in between but when I end phone call its not resuming back. Please help if anyone has faced same issue

Answer 1

CarPlay is not actually playing or pausing the music, it is still your app on the user's device that is doing all the work and CarPlay is just presenting an interface to interact with your app which is what you do in your CarPlaySceneDelegate

Therefore, the handling of how your app resumes after the call is not part of CarPlay.

You can try the following in your player management module:

1. Listen for audio interruption notifications

NotificationCenter.default
            .addObserver(self,
                         selector: #selector(handleInterruption(_:)),
                         name: AVAudioSession.interruptionNotification,
                         object: nil)

2. Check the status of the interruption and handle accordingly

@objc
private func handleInterruption(_ notification: Notification)
{
  // Check if we have valid information from the notification
  // with regards to the interruption
  guard let info = notification.userInfo,
        let typeValue = info[AVAudioSessionInterruptionTypeKey] as? UInt,
        let type = AVAudioSession.InterruptionType(rawValue: typeValue)
  else
  {
    return
  }
  
  // We check if the interruption has begun
  if type == .began
  {
    // Pause the AVPlayer in that case
    player?.pause()
  }
  else if type == .ended
  {
    // We check if we have instructions on how to handle the interruptions
    guard let optionsValue = info[AVAudioSessionInterruptionOptionKey] as? UInt else
    {
      return
    }
    
    // Convert the optionsValue into an AVAudioSession.InterruptionOptions
    // which can be tested
    let options = AVAudioSession.InterruptionOptions(rawValue: optionsValue)
    
    // Check if the playback can resume after the interruption
    if options.contains(.shouldResume)
    {
      // Request AVPlayer to resume the playback
      player?.play()
    }
  }
}

Give this a try and see if it helps your situation

Update based on OP comments

The audio not re-starting is not related to CarPlay, if you app resumes audio after a call, this will be carried over to CarPlay.

With that being said, if you have not already, add this code when your player initializes:

UIApplication.shared.beginReceivingRemoteControlEvents()

Maybe my code does not work for your exact scenario but I believe you will need to use the AVAudioSession.interruptionNotification which is what get's called when a phone call, siri or similar things interrupt your audio.

When this interruption has ended, you need to restart your audio.

I can't show you a CarPlay example, but here is an example of the above code in action when Siri interrupts the audio, the lock screen shows the status of the audio being paused, when Siri is dismissed, the app resumes the player as you can see.