avaudioplayer play music in background - xcode

Question

I have a problem with AVAudioPlayer in background, everything works but when I have the controls in the lock screen and I click on the pause button the control receive the event but the lock screen with controls disappears. I want that lock screen remain with controls like Music app.
I put these lines in viewDidLoad:
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback error:nil];
[[AVAudioSession sharedInstance] setActive: YES error: nil];
and then :
-(void)viewDidAppear:(BOOL)animated{
[[UIApplication sharedApplication]beginReceivingRemoteControlEvents];
[self becomeFirstResponder];
}
-(BOOL)canBecomeFirstResponder{ return YES; }
- (void)viewWillDisappear:(BOOL)animated {
//End recieving events
[[UIApplication sharedApplication] endReceivingRemoteControlEvents];
[self resignFirstResponder];
[super viewWillDisappear:animated];
}
- (void)remoteControlReceivedWithEvent:(UIEvent *)event {
//if it is a remote control event handle it correctly
if (event.type == UIEventTypeRemoteControl) {
if (event.subtype == UIEventSubtypeRemoteControlPause) {
[self.playButton setBackgroundImage:[UIImage imageNamed:#"play_icon.png"]
forState:UIControlStateNormal];
[self.audioPlayer pauseAudio];
self.isPaused = FALSE;
}
else if (event.subtype == UIEventSubtypeRemoteControlPlay){
if (!self.isPaused) {
[self.playButton setBackgroundImage:[UIImage imageNamed:#"pause.png"]
forState:UIControlStateNormal];
//start a timer to update the time label display
self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0
target:self
selector:#selector(updateTime:)
userInfo:nil
repeats:YES];
[self.audioPlayer playAudio];
self.isPaused = TRUE;
}
}
}
}

Answer 1

I find the solution !!
Using this property :
#property MPNowPlayingInfoCenter* nowPlayingInfo;
I have to add these lines on my viewDidLoad :
[MPNowPlayingInfoCenter defaultCenter].nowPlayingInfo=[NSDictionary dictionaryWithObject:#1.0f forKey:MPNowPlayingInfoPropertyPlaybackRate];