如何判斷髮送給MPMediaPlayer的消息是否超時？

Question

我一直在使用3.0 SDK的MPMediaPlayer框架。有時媒體播放器響應緩慢，或根本沒有響應。我在控制檯中收到警告消息，但用戶永遠不會看到這些消息（並因此責怪我的應用程序超時）。

有沒有辦法從這些超時恢復？我可以設置不重試嗎？

Answer 1

您的應用程序是否註冊以接收來自MPMediaPlayer的通知？我沒有看到這些超時，所以我不知道他們是否返回MPMoviePlayerContentPreloadDidFinishNotification與填充您的錯誤的userInfo。

從MPMoviePlayerController.h：

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

從MoviePlayer示例代碼：

// 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];