如何判断发送给MPMediaPlayer的消息是否超时？

Question

我一直在使用3.0 SDK的MPMediaPlayer框架。有时媒体播放器响应缓慢，或根本没有响应。我在控制台中收到警告消息，但用户永远不会看到这些消息（并因此责怪我的应用程序超时）。

有没有办法从这些超时恢复？我可以设置不重试吗？

Answer 1

您的应用程序是否注册以接收来自MPMediaPlayer的通知？我没有看到这些超时，所以我不知道他们是否返回MPMoviePlayerContentPreloadDidFinishNotification与填充您的错误的userInfo。

从MPMoviePlayerController.h：

MP_EXTERN NSString *const MPMoviePlayerContentPreloadDidFinishNotification; // userInfo contains NSError for @"error" key if preloading fails 

从MoviePlayer示例代码：

// Register to receive a notification that the movie is now in memory and ready to play 
[[NSNotificationCenter defaultCenter] addObserver:self 
       selector:@selector(moviePreloadDidFinish:) 
       name:MPMoviePlayerContentPreloadDidFinishNotification 
       object:nil]; 

// Register to receive a notification when the movie has finished playing. 
[[NSNotificationCenter defaultCenter] addObserver:self 
       selector:@selector(moviePlayBackDidFinish:) 
       name:MPMoviePlayerPlaybackDidFinishNotification 
       object:nil]; 

// Register to receive a notification when the movie scaling mode has changed. 
[[NSNotificationCenter defaultCenter] addObserver:self 
       selector:@selector(movieScalingModeDidChange:) 
       name:MPMoviePlayerScalingModeDidChangeNotification 
       object:nil];