在iOS上使用网址播放YouTube视频

Question

我正在尝试使用MPMoviePlayerController从我的iOS应用中的URL播放YouTube视频，但我只是得到一个黑屏并且没有播放。我究竟做错了什么？我已经验证了网址是否正确并且正在传递正确的videoId。

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.

    NSString *urlString = [NSString stringWithFormat:@"https://www.youtube.com/watch?v=%@", videoIDString];
    NSURL *videoURL = [NSURL URLWithString:urlString];
    MPMoviePlayerController *moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
    moviePlayerController.scalingMode = MPMovieScalingModeAspectFit;
    moviePlayerController.shouldAutoplay = YES;
    moviePlayerController.fullscreen = YES;
    [moviePlayerController.view setFrame:CGRectMake(0, 70, 320, 270)];
    [self.view addSubview:moviePlayerController.view];
    [moviePlayerController play];
}