Question

I’m trying to detect user input (a click) on the headphones connected to an iPhone. So far I’ve only found how to detect interruptions using AVAudioSession. Is AVAudioSession right or is there another way? how?

Answer 1

You want this:

beginReceivingRemoteControlEvents

You implement something this in one of your VCs classes:

 // If using a nonmixable audio session category, as this app does, you must activate reception of 
//    remote-control events to allow reactivation of the audio session when running in the background.
//    Also, to receive remote-control events, the app must be eligible to become the first responder.
- (void) viewDidAppear: (BOOL) animated {

    [super viewDidAppear: animated];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}

- (BOOL) canBecomeFirstResponder {

    return YES;
}


    // Respond to remote control events

- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {

    if (receivedEvent.type == UIEventTypeRemoteControl) {

        switch (receivedEvent.subtype) {

            case UIEventSubtypeRemoteControlTogglePlayPause:
                [self playOrStop: nil];
                break;

            default:
                break;
        }
    }
}

See the sample code here.