I'm currently attempting to set up background audio for an app I'm developing for iOS 4. The app doesn't have a dedicated music player viewController
, however, unlike other background audio apps such as Pandora, which makes the task a bit more confusing.
I've set the appropriate Info.plist
settings correctly and have an AVAudioPlayer
object in my app delegate which is accessible from everywhere. When the user plays a song, I replace the AVAudioPlayer
with a new one initialized with the song and play it. This all works great, except now I have no idea how to go about supporting remote control events.
Based on Apple's documentation, I have this:
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
switch(event.subtype) {
case UIEventSubtypeRemoteControlTogglePlayPause:
if([iPhoneAppDelegate backgroundAudioPlayer].playing)
[iPhoneAppDelegate pauseBackgroundAudioPlayer];
else
[iPhoneAppDelegate playBackgroundAudioPlayer];
break;
}
}
The thing is, where do I put this? Apple's documentation seems to suggest this should go in some view controller somewhere, but my app has lots of view controllers and navigation controllers. Wherever I try to put this, for some reason tapping the Toggle Play/Pause button in the multitasking tray remote controls either causes the song to just pause for a moment and then unpause, or somehow causes the song to play twice.
The documentation examples are a bit misleading, but there is no need to subclass anything anywhere. The correct place to put remoteControlReceivedWithEvent: is in the application delegate, as it remains in the responder chain regardless of whether the app is in the foreground or not. Also the begin/end receiving remote control events should be based on whether you actually need the events, not on the visibility of some random view.