Question

我正在尝试创建一个视频停止播放后显示信息页面的应用。我看过这里发布的类似问题并试图实现它，但它仍然无法正常工作。我在movieFinishedCallback方法中放了一个NSLog，但是从来没有出现过，所以我猜它甚至没有被调用。有人可以帮我搞清楚吗？

这是我的实施代码......

-(IBAction)playvideo {


    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]
                                         pathForResource:@"sample" ofType:@"mov"]];

    MPMoviePlayerViewController *playercontroller = [[MPMoviePlayerViewController alloc]
                                                     initWithContentURL:url];

    [[NSNotificationCenter defaultCenter]
     addObserver:self
     selector:@selector(movieFinishedCallback:)                                                 
     name:MPMoviePlayerPlaybackDidFinishNotification
     object:playercontroller];



    [self presentMoviePlayerViewControllerAnimated:playercontroller];

    playercontroller.moviePlayer.movieSourceType = MPMovieSourceTypeFile;


    [playercontroller.moviePlayer play];


    playercontroller = nil;

} 


- (void) movieFinishedCallback:(NSNotification*) notification {

  NSLog (@"The video ended");

  MPMoviePlayerController *player = [notification object];
    [[NSNotificationCenter defaultCenter] 
     removeObserver:self
     name:MPMoviePlayerPlaybackDidFinishNotification
     object:player];    
    player = nil;


    View2 *second =[[View2 alloc] initWithNibName:nil bundle:nil];

    [self presentModalViewController:second animated:YES];

}

Answer 1

我认为你可能会在电影结束后回电话，但在呈现View2时会失败。

View2是UIViewController的子类吗？我无法通过将nil传递给initWithNibName来看到如何获得有效结果：我建议在movieFinishedCallback中使用NSLog来证明你到达那里。然后是NSLog（@“second =％@”，第二个）;我的猜测是没有。

修复方法是使用有效的笔尖或故事板加载一个真实的视图控制器......

// @"MainStoryboard" should be the name of the storyboard containing your VC
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil];

// @"SomeViewController" has to be set on the attributes inspector of the VC
// in the storyboard
SomeViewController *newVC = [storyboard instantiateViewControllerWithIdentifier:@"SomeViewController"];
[self presentModalViewController:newVC animated:YES];

Answer 2

最终让它发挥作用！我不知道是否与MPMoviePlayerViewController没有响应NSNotificationCenter这一事实有关，但我使用MPMoviePlayerController来显示我的视频，注册了movieFinishedCallback的通知，然后使用movieFinishedCallback方法切换视图。请参阅本教程了解视频播放http://www.techotopia.com/index.php/Video_Playback_from_within_an_iOS_5_iPhone_Application。唯一的问题是，现在视频不会旋转到风景！

MovieFinishedCallback通知未触发

2 个答案: