你可以使用这段代码来阻止控制器播放在播放结束后自动dismissing（消失），并且捕捉到用户点击完成的按钮事件去自己定义并处理让你的MPMoviePlayerViewController播放器的消失（dismiss）的时机
步骤 1. - 创建并初始化一个MPMoviePlayerViewController（videoPlayer）
MPMoviePlayerViewController *videoPlayer = [[MPMoviePlayerViewController alloc] initWithContentURL:[[NSURL alloc ]initWithString:[aURL];
步骤 2. - 移除videoPlayer默认的通知事件并且加入自己的通知事件。
[[NSNotificationCenter defaultCenter] removeObserver:videoPlayer
name:MPMoviePlayerPlaybackDidFinishNotification object:videoPlayer.moviePlayer];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:@selector(videoFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:videoPlayer.moviePlayer];
步骤 3. - 手动显示你的videoPlayer控制器
[self presentMoviePlayerViewControllerAnimated:videoPlayer];
步骤 4. - 添加 videoFinish: 方法处理通知事件
-(void)videoFinished:(NSNotification*)aNotification{
int value = [[aNotification.userInfo valueForKey:MPMoviePlayerPlaybackDidFinishReasonUserInfoKey] intValue];
if (value == MPMovieFinishReasonUserExited) {
[self dismissMoviePlayerViewControllerAnimated];
}
}
