How to add rewind buttons to lock screen? - ios

Question

I have realized representation of my AVPlayer on iPhone lock screen via MPNowPlayingInfoCenter. But I can't found how to add ±15 seconds rewind buttons like in standard Music app.
So the question is How to add this buttons on lock screen?

Answer 1

I'm using AVAudioPlayer at the moment, but the remote controlling method which is - (void)remoteControlReceivedWithEvent:(UIEvent *)event must not be involved with the type of the player you're using.
Follow this:
In your view controller's viewDidLoad method add the following code:
//Make sure the system follows our playback status - to support the playback when the app enters the background mode.
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
Then add these methods:
viewDidAppear:: (if not implemented already)
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
//Once the view has loaded then we can register to begin recieving controls and we can become the first responder
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
viewWillDisappear: (if not implemented already)
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
//End recieving events
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
}
And:
//Make sure we can recieve remote control events
- (BOOL)canBecomeFirstResponder {
return YES;
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
//if it is a remote control event handle it correctly
if (event.type == UIEventTypeRemoteControl)
{
if (event.subtype == UIEventSubtypeRemoteControlPlay)
{
[self playAudio];
}
else if (event.subtype == UIEventSubtypeRemoteControlPause)
{
[self pauseAudio];
}
else if (event.subtype == UIEventSubtypeRemoteControlTogglePlayPause)
{
[self togglePlayPause];
}
else if (event.subtype == UIEventSubtypeRemoteControlBeginSeekingBackward)
{
[self rewindTheAudio]; //You must implement 15" rewinding in this method.
}
else if (event.subtype == UIEventSubtypeRemoteControlBeginSeekingForward)
{
[self fastForwardTheAudio]; //You must implement 15" fast-forwarding in this method.
}
}
}
This is working fine in my app, however if you want to be able to receive remote control events in all view controllers, then you should set it in the AppDelegate.