ios – beginReceivingRemoteControlEvents不会触发Apple Music的事件

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我正在从我的应用程序播放Apple Music,苹果音乐播放器代码如下 – 
  1. -(void) submitAppleMusicTrackWithProductID: (NSString *) productID // productID in US is the last numbers after i= in the share URL from Apple Music
  2. {
  3.  
  4.     [SKCloudServiceController requestAuthorization:^(SKCloudServiceAuthorizationStatus status) {
  5.         NSLog(@"status is %ld",(long)status);
  6.         SKCloudServiceController *cloudServiceController;
  7.         cloudServiceController = [[SKCloudServiceController alloc] init];
  8.         [cloudServiceController requestCapabilitiesWithCompletionHandler:^(SKCloudServiceCapability capabilities,NSError * _Nullable error) {
  9.             NSLog(@"%lu %@",(unsigned long)capabilities,error);
  10.  
  11.             if (capabilities >= SKCloudServiceCapabilityAddToCloudMusicLibrary || capabilities==SKCloudServiceCapabilityMusicCatalogPlayback)
  12.             {
  13.                 NSLog(@"You CAN add to iCloud!");
  14.                 [[MPMediaLibrary defaultMediaLibrary] addItemWithProductID:productID completionHandler:^(NSArray<__kindof MPMediaEntity *> * _Nonnull           entities,NSError * _Nullable error)
  15.                  {
  16.                      NSLog(@"added id%@ entities: %@ and error is %@",productID,entities,error);
  17.                      NSArray *tracksToPlay = [NSArray arrayWithObject:productID];
  18.                  [[MPMusicPlayerController applicationMusicPlayer] setQueueWithStoreIDs:tracksToPlay];
  19.                     [[MPMusicPlayerController applicationMusicPlayer] stop];
  20.                  [[MPMusicPlayerController applicationMusicPlayer] play];
  21.                    self.isTrackChangedByNextPrevIoUsButton = NO;
  22.  
  23.         [[NSNotificationCenter defaultCenter]removeObserver:self name:MPMusicPlayerControllerNowPlayingItemDidChangeNotification object:nil];
  24.         [[NSNotificationCenter defaultCenter]removeObserver:self name:MPMusicPlayerControllerPlaybackStateDidChangeNotification object:nil];
  25.  
  26.         [[NSNotificationCenter defaultCenter] addObserver:self
  27.                                                               selector:@selector(handleTrackChanged:)
  28.                                                                   name:MPMusicPlayerControllerNowPlayingItemDidChangeNotification
  29.                                                                 object:nil];
  30.         [[NSNotificationCenter defaultCenter] addObserver:self
  31.                                                               selector:@selector(handlePlaybackStateChanged:)
  32.                                                                   name:MPMusicPlayerControllerPlaybackStateDidChangeNotification
  33.                                                                 object:nil];
  34.  
  35.  
  36.                      [[MPMusicPlayerController applicationMusicPlayer] beginGeneratingPlaybackNotifications];
  37.                      [[MPMusicPlayerController applicationMusicPlayer] setRepeatMode: MPMusicRepeatModeNone];
  38.                  }];
  39.  
  40.  
  41.             }
  42.             else
  43.             {
  44.                 NSLog(@"Blast! The ability to add Apple Music track is not there. sigh.");
  45.             }
  46.  
  47.         }];
  48.  
  49.     }];
  50. }
  51.  
  52. -(void)handleTrackChanged:(id )notification
  53. {
  54.     if (!self.AppleMusicPreviuosTrack)
  55.     {        
  56.         self.AppleMusicPreviuosTrack = [[Tracks alloc] init];
  57.     }
  58.     if (self.AppleMusicPreviuosTrack.trackId == self.CurrentTrack.trackId && [MPMusicPlayerController applicationMusicPlayer].currentPlaybackRate == 0 && !self.isSongChangedManually)
  59.     {
  60.         self.isSongChangedManually = YES;
  61.         [self FilterArtistsTracks:@"next" :^(Tracks *track,NSError *err)
  62.          {
  63.  
  64.          }];
  65.  
  66.     }
  67.     else
  68.     {
  69.      if ([[MPMusicPlayerController applicationMusicPlayer] currentPlaybackRate]==1)
  70.      {
  71.     self.AppleMusicPreviuosTrack.trackId = self.CurrentTrack.trackId;
  72.     [[NSNotificationCenter defaultCenter] postNotificationName:kTrackChanged object:nil];
  73.          //Delay execution of my block for 20 seconds.
  74.  dispatch_after(dispatch_time(DISPATCH_TIME_NOW,30 * NSEC_PER_SEC),dispatch_get_main_queue(),^{
  75.      self.isSongChangedManually = NO;
  76.  });
  77.  
  78.      }
  79.     }
  80. }
  81.  
  82. -(void)handlePlaybackStateChanged:(id )notification
  83. {
  84.     NSLog(@"handle_PlaybackStateChanged");
  85.      [[NSNotificationCenter defaultCenter] postNotificationName:kDidTrackPlaybackStatus object:nil];
  86.     if ([MPMusicPlayerController applicationMusicPlayer].currentPlaybackRate>0)
  87.     {
  88.         [self.playerMenuView.playpauseButton setImage:[UIImage imageNamed:@"pause"] forState:UIControlStateNormal];
  89.     }
  90.     else
  91.     {
  92.         [self.playerMenuView.playpauseButton setImage:[UIImage imageNamed:@"play"] forState:UIControlStateNormal];
  93.     }
  94.  
  95. }

这工作得很好.现在我想从锁定屏幕控制轨道,为此我在viewWillAppear中执行了以下代码

  1. [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
  2.    [APP_DELEGATE becomeFirstResponder];

和remoteControlReceivedWithEvent方法在AppDelegate文件中编写如下 – 

  1. -(void)remoteControlReceivedWithEvent:(UIEvent *)event
  2. {
  3.     switch (event.subtype)
  4.     {
  5.         case UIEventSubtypeRemoteControlTogglePlayPause:
  6.             [APP_DELEGATE PlayPauseMusic:nil];
  7.             //[streamer pause];
  8.             break;
  9.         case UIEventSubtypeRemoteControlPlay:
  10.             [APP_DELEGATE PlayPauseMusic:nil];
  11.             //[streamer start];
  12.             break;
  13.         case UIEventSubtypeRemoteControlPause:
  14.             [APP_DELEGATE PlayPauseMusic:nil];
  15.             //[streamer pause];
  16.             break;
  17.         case UIEventSubtypeRemoteControlStop:
  18.             [APP_DELEGATE PlayPauseMusic:nil];
  19.  
  20.             //[streamer stop];
  21.             break;
  22.         case UIEventSubtypeRemoteControlNextTrack:
  23.  
  24.             [APP_DELEGATE next:nil];
  25.  
  26.             break;
  27.         case UIEventSubtypeRemoteControlPrevIoUsTrack:
  28.             [APP_DELEGATE prevIoUs:nil];
  29.  
  30.  
  31.             break;
  32.  
  33.         default:
  34.             break;
  35.     }
  36. }

注 – 如果AVPlayer正在播放iTunes曲目,则每次都会触发remoteControlReceivedWithEvent.Spotify iOS SDK会播放Spotify曲目.

但是,播放Apple Music曲目时,相同的代码不会触发 – 

  1. [MPMusicPlayerController applicationMusicPlayer]      
  2.  
  3.                  or
  4.  
  5.  [MPMusicPlayerController systemMusicPlayer]

任何帮助将不胜感激.谢谢

解决方法

而不是使用 – (void)remoteControlReceivedWithEvent：(UIEvent *)事件来跟踪控件,使用MPRemoteCommandCenter向每个控件添加目标：

Note: It’s important to enable the controls before assigning a target.

  1. [MPRemoteCommandCenter sharedCommandCenter].playCommand.enabled = YES;
  2. [[MPRemoteCommandCenter sharedCommandCenter].playCommand addTarget:self action:@selector(remotePlay)];
  3.  
  4. [MPRemoteCommandCenter sharedCommandCenter].pauseCommand.enabled = YES;
  5. [[MPRemoteCommandCenter sharedCommandCenter].pauseCommand addTarget:self action:@selector(remoteStop)];
  6.  
  7. [MPRemoteCommandCenter sharedCommandCenter].prevIoUsTrackCommand.enabled = YES;
  8. [[MPRemoteCommandCenter sharedCommandCenter].prevIoUsTrackCommand addTarget:self action:@selector(loadPrevIoUsSong)];
  9.  
  10. [MPRemoteCommandCenter sharedCommandCenter].nextTrackCommand.enabled = YES;
  11. [[MPRemoteCommandCenter sharedCommandCenter].nextTrackCommand addTarget:self action:@selector(loadNextSong)];

选择：

  1. -(void) remotePlay {
  2.     [APP_DELEGATE PlayPauseMusic:nil];
  3. }
  4. -(void) remoteStop {
  5.     [APP_DELEGATE PlayPauseMusic:nil];
  6. }
  7. -(void) loadNextSong {
  8.     [APP_DELEGATE next:nil];
  9. }
  10. -(void) loadPrevIoUsSong {
  11.     [APP_DELEGATE prevIoUs:nil];
  12. }

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