iPad 中的 Mpmovieplayercontroller - 无视频，仅音频

Question

我正在开发一个 iPad 应用程序，在其中播放应用程序本身存储的视频。我在表格视图中表示视频列表。当我选择一行时，视频 对应于该行播放。但在执行此操作时，有时屏幕会变黑，看不到视频，但只播放音频。

我知道使视频以全屏模式播放或使用 MPMoviePlayerViewController 可以消除此问题。但我的要求是我不想一开始就全屏播放电影。请指导我如何实现这一目标。

-(void)playMovie {
   MPMoviePlayerController *movieController = [[MPMoviePlayerController alloc]     initWithContentURL:movieUrl];
   self.moviePalyer = movieController;
   [movieController release];

 [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePalyerDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object: self.moviePalyer];

 self.moviePalyer.view.frame = CGRectMake(240, 0, 561, 313);
 self.moviePalyer.view.backgroundColor = [UIColor clearColor];
 [self.moviePalyer prepareToPlay];
 [self.view addSubview: self.moviePalyer.view];
 [self.moviePalyer play];

}
-(void)moviePalyerDidFinish:(NSNotification*)notification
{
 [moviePalyer.view removeFromSuperview];
 [moviePalyer stop];
 moviePalyer.initialPlaybackTime = -1.0;

 [[NSNotificationCenter defaultCenter] removeObserver:self
             name:MPMoviePlayerPlaybackDidFinishNotification
              object:moviePalyer];
 [moviePalyer release];
 moviePalyer = nil;
}

注意：这是在 ipad 模拟器上

Answer 1

我已经解决了这个问题。以前，我为每个行选择创建 MPMoviePlayerController，并在 moviedidfinish 通知方法中释放它。但是现在，我不再为每个行选择创建 movieplayercontroller，而是重用已创建的 MPMoviePlayerControler 对象。

以下是代码片段：

-(void)playMovie
{
   if(self.moviePalyer == nil)
   {

    MPMoviePlayerController *movieController = [[MPMoviePlayerController alloc] initWithContentURL:url];
    self.moviePalyer = movieController;
    [movieController release];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePalyerDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:self.moviePalyer];

    self.moviePalyer.repeatMode = MPMovieRepeatModeOne;
    self.moviePalyer.view.frame = CGRectMake(240, 0, 561, 313);
    self.moviePalyer.view.backgroundColor = [UIColor clearColor];
}
else 
{
    [self.moviePalyer setContentURL:url];
    [self stopMovie];
}
[self.view addSubview: self.moviePalyer.view];
[self.moviePalyer play];
   }
   -(void)stopMovie
   {
     [self.moviePalyer.view removeFromSuperview];
[self.moviePalyer stop];
self.moviePalyer.initialPlaybackTime = -1.0;
   }

我在 dealloc 方法中释放 moviePlayer 对象。

希望这对遇到同样问题的人有所帮助。