Question

In my app i want let user to control audio playback in background. I set backGround modes in .plist, and in plays in bg just like i wanted.But i can’t get any response from touching the control buttons.

I set the AudioSession like this

[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance]setActive:YES error:nil];

Then, in viewContoller where my player is placed i beginReceivingRemoteControlEvents like this

 if ([[UIApplication sharedApplication] respondsToSelector:@selector(beginReceivingRemoteControlEvents)]){
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:NULL];
    [self becomeFirstResponder];
    NSLog(@"Responds!");
}

And it prints Responds!

But the problem is that this method is never called

    - (void)remoteControlReceivedWithEvent:(UIEvent *)event
{
    NSLog(@"Where is my event?");
    if(event.type == UIEventTypeRemoteControl)
    {
        switch (event.subtype) {
            case UIEventSubtypeRemoteControlTogglePlayPause:
                NSLog(@"Pause");
                [self playWords:playButton];
                break;
            case UIEventSubtypeRemoteControlNextTrack:
                NSLog(@"Next");
                [self next];
                break;
            case UIEventSubtypeRemoteControlPreviousTrack:
                NSLog(@"Prev");
                [self prev];
                break;

        }
    }

I even tried to write a category on UIApplication to let it become the first responder, but it doesn’t help

@implementation UIApplication (RemoteEvents)
-(BOOL)canBecomeFirstResponder
{
    return YES;
}
@end

Why can this happen?

SOLUTION
Here’s what solved my problem Entering background on iOS4 to play audio

Answer 1

I have done the same work in my project, it’s working fine. Please follow this, perhaps it will help you. Change the event name etc. In my code _audio is the object of AVAudioPlayer.

- (void)viewDidLoad {
    NSError *setCategoryErr = nil;
    NSError *activationErr  = nil;
    [[AVAudioSession sharedInstance] setCategory: AVAudioSessionCategoryPlayback error: &setCategoryErr];
    [[AVAudioSession sharedInstance] setActive: YES error: &activationErr];
}

- (void)viewWillAppear {

      [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}


- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
    switch (event.subtype) {
        case UIEventSubtypeRemoteControlPlay:
            [_audio play];
            break;
        case UIEventSubtypeRemoteControlPause:
            [_audio pause];
            break;
        default:
            break;
    }
}