iOS媒體框架

Question

我正在實施一些視頻到我的iPad應用程序，它的工作正常。但我遇到的問題是，當我離開視圖導航到其他地方時，視頻音頻在後臺繼續播放。是否有辦法在關閉視圖之前完全停止視頻並將其從視圖中刪除？

我嘗試：

[moviePlayerController停車]; - 但這似乎並沒有阻止電影剛剛崩潰的應用程序。

[moviePlayerController.view removeFromSuperview]; - 從視圖中刪除視頻，但不會停止音頻。

這是我的代碼：

- (IBAction)PlayMediaButton:(id)sender 
{ 

[moviePlayerController stop]; 

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:) 
              name:MPMoviePlayerPlaybackDidFinishNotification object:nil]; 

NSString *movpath = [[NSBundle mainBundle] pathForResource:@"albert" ofType:@"mp4"]; 
MPMoviePlayerViewController* mpviewController = [[MPMoviePlayerViewController alloc] 
               initWithContentURL:[NSURL fileURLWithPath:movpath]]; 

if ([[NSFileManager defaultManager] fileExistsAtPath:movpath])  //Does file exist? 
{ 
    moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:movpath]]; 

    [[NSNotificationCenter defaultCenter] addObserver:self 
              selector:@selector(moviePlaybackComplete:) 
               name:MPMoviePlayerPlaybackDidFinishNotification 
               object:moviePlayerController]; 

    moviePlayerController.view.frame = CGRectMake(38, 37, 986, 618); 
    [self.view addSubview:moviePlayerController.view]; 
    [moviePlayerController play]; 

    if ([moviePlayerController respondsToSelector:@selector(setAllowsAirPlay:)]) //Allow airplay if availabe 
     [moviePlayerController setAllowsAirPlay:YES]; 

    [moviePlayerController play]; 

}    
} 



- (void)moviePlaybackComplete:(NSNotification *)notification 
{ 
    MPMoviePlayerController *moviePlayerController = [notification object]; 
    [[NSNotificationCenter defaultCenter] removeObserver:self 
                name:MPMoviePlayerPlaybackDidFinishNotification 
                object:moviePlayerController]; 

    [moviePlayerController.view removeFromSuperview]; 
    [moviePlayerController release]; 
} 

Answer 1

如果我正確地跟着你，你應該在-viewWillDisappear:停止電影播放器​​。

- (void)viewWillDisappear:(BOOL)animated 
{ 
    [super viewWillDisappear:animated]; 
    [moviePlayerController stop]; 
} 

編輯只注意到你正在創建一個MPMoviePlayerViewController而不是MPMoviePlayerController的。前者是爲了模態顯示，因爲它是UIViewController的子類。這解釋了崩潰，因爲MPMoviePlayerViewController不響應-stop消息。因此，要麼將moviePlayerController與-presentModalViewController:animated:一起顯示，要麼將其類型更改爲MPMoviePlayerController，並將其添加到您的視圖中，如同現在一樣。