iOS 後臺音訊播放控制，鎖屏音訊播放控制及音訊資訊設定，效果圖如下：

1.在AppDelegate.m 中實現下面方法，獲取音訊播放、暫停、上一首、下一首點選事件：

- (BOOL)canBecomeFirstResponder
{
 return YES;
}
 
//鎖屏介面控制監聽
- (void)remoteControlReceivedWithEvent:(UIEvent *)event
{
 if (event.type == UIEventTypeRemoteControl) {
  switch (event.subtype) {
   case UIEventSubtypeRemoteControlPlay:
   {
    //播放
    NSLog(@"Play");
    break;
   }
   case UIEventSubtypeRemoteControlPause:
   {
    //暫停
    NSLog(@"Pause");
    break;
   }
   case UIEventSubtypeRemoteControlNextTrack:
   {
    //下一首
    NSLog(@"Next");
    break;
   }
   case UIEventSubtypeRemoteControlPreviousTrack:
   {
    //上一首
    NSLog(@"Previous");
    break;
   }
   default:
    break;
  }
 }
}

2.設定鎖屏資訊：

//設定鎖屏資訊
- (void)setLockingInfo
{
 Class playingInfoCenter = NSClassFromString(@"MPNowPlayingInfoCenter");
 
 if (playingInfoCenter) {
  //音訊模型
  HWMusicModel *model = [HWMusicTool playingMusic];
  
  //資料資訊
  NSMutableDictionary *songInfo = [[NSMutableDictionary alloc] init];
  
  //圖片
  MPMediaItemArtwork *albumArt = [[MPMediaItemArtwork alloc] initWithImage:[UIImage imageWithUrlString:model.icon]];
  [songInfo setObject:albumArt forKey:MPMediaItemPropertyArtwork];
  
  //當前播放時間
  [songInfo setObject:[NSNumber numberWithDouble:[[[HWMusicTool shareMusicTool] Player] currentPlaybackTime]] forKey:MPNowPlayingInfoPropertyElapsedPlaybackTime];
  //速率
  [songInfo setObject:[NSNumber numberWithFloat:1.0f] forKey:MPNowPlayingInfoPropertyPlaybackRate];
  //剩餘時長
  [songInfo setObject:[NSNumber numberWithDouble:[[[HWMusicTool shareMusicTool] Player] duration]] forKey:MPMediaItemPropertyPlaybackDuration];
  
  //設定標題
  [songInfo setObject:model.title forKey:MPMediaItemPropertyTitle];
  
  //設定副標題
  [songInfo setObject:@"周杰倫 - 周杰倫的床邊故事" forKey:MPMediaItemPropertyArtist];
  
  //設定音訊資料資訊
  [[MPNowPlayingInfoCenter defaultCenter] setNowPlayingInfo:songInfo];
 }
}

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