remoteControlReceivedWithEventを受信できません - 目的c - ios

スクリーンがロックされた後、バックグラウンドでオーディオとビデオを再生できるようにすることに成功しました。しかし、ユーザーエクスペリエンスを向上させるためには、ロックされた画面上で実行中のメディアの再生と一時停止のコントロールを表示する必要があります。remoteControlReceivedWithEventを受信できません - 目的c - ios

@interface MyControllerClass() <UIGestureRecognizerDelegate, UIApplicationDelegate> 

- (void)viewDidAppear:(BOOL)animated { 
[super viewDidAppear:animated]; 
[[UIApplication sharedApplication] beginReceivingRemoteControlEvents]; 
[self becomeFirstResponder]; 

    AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:url options:nil]; 
    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithAsset:avAsset]; 
    AVAudioSession *session = [AVAudioSession sharedInstance]; 
    [session setCategory:AVAudioSessionCategoryPlayback error:nil]; 
    NSError *activationError = nil; 
    BOOL success = [[AVAudioSession sharedInstance] setActive: YES error: &activationError]; 
} 

- (void)viewWillDisappear:(BOOL)animated { 
[[UIApplication sharedApplication] endReceivingRemoteControlEvents]; 
[self resignFirstResponder]; 
[super viewWillDisappear:animated]; 
} 

- (BOOL) canBecomeFirstResponder { 
return YES; 
} 

- (void) remoteControlReceivedWithEvent: (UIEvent *) receivedEvent { 
NSLog(@"received event %@",receivedEvent); 
if (receivedEvent.type == UIEventTypeRemoteControl) { 
    switch (receivedEvent.subtype) { 
     case UIEventSubtypeRemoteControlTogglePlayPause: { 
      if ([self isVideoPlaying]) { 
       [self.avPlayer pause]; 
      } else { 
       [self.avPlayer play]; 
      } 
      break; 
     } 
     case UIEventSubtypeRemoteControlPlay: { 
      [self.avPlayer play]; 
      break; 
     } 
     case UIEventSubtypeRemoteControlPause: { 
      [self.avPlayer pause]; 
      break; 
     } 
     default: 
      break; 
    } 
} 
}

追加のバックグラウンドモードはInfo.plistの