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通过调用在 viewDidLoad 方法中播放视频的函数，我已经能够在应用程序启动时成功播放视频。但是这样做时，我看不到“完成”按钮。只有当我在按钮的帮助下调用相同的函数时，才会出现“完成”按钮。我在下面发布代码。我将如何通过在 viewDidLoad 方法中调用相同的函数来完成此操作？我做错了什么？谢谢！

在我的 viewcontroller.m 文件中

- (void)viewDidLoad
{
      [super viewDidLoad];

      [self playMedia];
}

- (void) playMedia {

        //hide status bar first
        [[UIApplication sharedApplication] setStatusBarHidden:YES];
        //resets again in playMediaFinished

        movieFile = [[NSBundle mainBundle] pathForResource:@"sec" ofType:@"mp4"];
        NSURL *url = [NSURL fileURLWithPath: movieFile];

        moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:url];

        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(playMediaFinished:) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer];

        moviePlayer.controlStyle = MPMovieControlStyleDefault;

        [moviePlayer setFullscreen:NO animated:YES];
        [self.view addSubview:moviePlayer.view];

        moviePlayer.controlStyle = MPMovieControlStyleDefault;

        CGAffineTransform transform = self.view.transform;

        [moviePlayer.view setFrame:CGRectMake(0, 0, 480, 320)];

        moviePlayer.shouldAutoplay = YES;

        NSLog(@"Should be playing Movie");

    }

- (void) playMediaFinished: (NSNotification*) theNotification {
       moviePlayer = [theNotification object];

        [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayer];

        if ([moviePlayer
             respondsToSelector:@selector(setFullscreen:animated:)])
        {
            [moviePlayer.view removeFromSuperview];
            [playerView removeFromSuperview];
            //reset status bar
            [[UIApplication sharedApplication] setStatusBarHidden:NO];
        }    
            NSLog(@"Should be DONE playing Movie");

    }
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1 回答 1

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尝试使用viewDidAppear而不是viewDidLoad. viewDidLoad考虑到您在主视图出现在屏幕上之前呈现视频，开始播放视频会导致意外行为，我并不感到惊讶。请记住，视图在实际可见之前已完成加载。

于 2012-08-05T14:29:28.013 回答