• (void) viewWillAppear:(BOOL)animated
  {
  [super viewWillAppear:animated];
  [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
  [self becomeFirstResponder];
  }

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

pragma mark - Player Controll

• (void)remoteControlReceivedWithEvent: (UIEvent *) receivedEvent {
  NSMutableDictionary * info = [NSMutableDictionary dictionary];
  //音乐的标题
  [info setObject:@"leao" forKey:MPMediaItemPropertyTitle];
  //音乐的艺术家
  [info setObject:@"chocolate" forKey:MPMediaItemPropertyArtist];
  //音乐的播放时间
  [info setObject:@(self.audioPlayer.duration) forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
  //音乐的播放速度
  [info setObject:@(1) forKey:MPNowPlayingInfoPropertyPlaybackRate];
  //音乐的总时间
  [info setObject:@(self.audioPlayer.duration) forKey:MPMediaItemPropertyPlaybackDuration];
  //音乐的封面
  MPMediaItemArtwork * artwork = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imageNamed:@"main_icon_review"]];
  [info setObject:artwork forKey:MPMediaItemPropertyArtwork];
  //完成设置
  [[MPNowPlayingInfoCenter defaultCenter]setNowPlayingInfo:info];

  if (receivedEvent.type == UIEventTypeRemoteControl) {

    switch (receivedEvent.subtype) {
  
        case UIEventSubtypeRemoteControlTogglePlayPause:
  
            break;
  
        case UIEventSubtypeRemoteControlPreviousTrack:
  
            break;
  
        case UIEventSubtypeRemoteControlNextTrack:
  
            break;
  
        default:
            break;
    }
  

  }
  }