iPhone SDK-presentMoviePlayerViewController无动画但有音频

Question

I'm trying to show a MPMoviePlayerViewController.

MPMoviePlayerViewController* theMoviePlayer = [[MPMoviePlayerViewController alloc]
                              initWithContentURL:[NSURL URLWithString:media_url]];

If I'm adding theMoviePlayer View to the current view via addSubview , everything is fine. But if I'm trying to show the player in a modal window, only the audio of the video is played back in the background. The view is not beeing displayed.

[self presentMoviePlayerViewControllerAnimated:theMoviePlayer]; 

Answer 1

I guessed you called presentMoviePlayerViewControllerAnimated in viewDidLoad and your view controller was not added to a navigation stack.

[self presentMoviePlayerViewControllerAnimated] will present MPMoviePlayerViewController as modal view and you can only present modal view controllers from controllers that have already been shown onscreen.

So to fix it you can either <1> push your view controller into a navigation stack and call [self presentMoviePlayerViewControllerAnimated] after viewDidLoad

<2> Without a navigation stack you need to call [self presentMoviePlayerViewControllerAnimated] in the next run loop after viewDidLoad, eg with a IBAction or using dispatch_after