在电影播放器上按下“完成”时，MPMoviePlayerPlaybackDidFinishNotification 不起作用答案

【问题标题】：MPMoviePlayerPlaybackDidFinishNotification not working when 'DONE' is pressed on movie player在电影播放器上按下“完成”时，MPMoviePlayerPlaybackDidFinishNotification 不起作用
【发布时间】：2011-07-08 08:44:20
【问题描述】：

我一直在努力解决这个问题并尝试遵循任何建议，但在用户在电影播放器上按下“完成”后，我似乎无法让“MPMoviePlayerPlaybackDidFinishNotification”工作。

- (void)myMovieFinishedCallback:(NSNotification*)aNotification {
     MPMoviePlayerController* theMovie=[aNotification object];
     [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];
     [theMovie pause];
     [theMovie stop]; 
     [theMovie autorelease]; 
     [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:YES];
 }

- (void)myMovieViewFinishedCallback:(NSNotification*)aNotification {
     MPMoviePlayerViewController* theMovieView=[aNotification object];
     [self dismissMoviePlayerViewControllerAnimated];
     [[NSNotificationCenter defaultCenter]removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:theMovieView];
     [theMovieView pause];
     [theMovieView stop];
     [theMovieView autorelease];
     [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationPortrait animated:YES];
 }

- (IBAction)safetyVideo:(id)sender {
     NSString *path = [[NSBundle mainBundle] pathForResource:@"Ball_Crunch" ofType:@"m4v"];

     if ([[[UIDevice currentDevice] systemVersion] doubleValue] >= 3.2) {
         MPMoviePlayerViewController*tmpMoviePlayViewController=[[[MPMoviePlayerViewController alloc] initWithContentURL:[NSURL fileURLWithPath:path]] retain];
         if (tmpMoviePlayViewController) {
             [self presentMoviePlayerViewControllerAnimated:tmpMoviePlayViewController]; 
             tmpMoviePlayViewController.moviePlayer.movieSourceType = MPMovieSourceTypeFile;
             [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieViewFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:tmpMoviePlayViewController];

             [tmpMoviePlayViewController.moviePlayer play];
         }

     }else{
         MPMoviePlayerController* theMovie = [[[MPMoviePlayerController alloc] initWithContentURL:[NSURL fileURLWithPath:path]] retain];
         [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(myMovieFinishedCallback:) name:MPMoviePlayerPlaybackDidFinishNotification object:theMovie];

         [theMovie play];
     }
}

电影播放正常并在按下“完成”时消失，但从未调用回调。有什么建议吗？

谢谢。

【问题讨论】：

有人在吗？ * 蟋蟀 *

标签： xcode

【解决方案1】：

我也遇到了这个问题，没有其他解决方案适合我。问题是添加观察者的时候，object参数应该是tmpMoviePlayViewController.moviePlayer而不仅仅是moviePlayer。

发送通知的是 tmpMoviePlayViewController.moviePlayer（MPMoviePlayerController 类），而不是 tmpMoviePlayViewController（MPMoviePlayerViewController 类）。

所以改变这个：

[[NSNotificationCenter defaultCenter] addObserver:self
     selector:@selector(myMovieViewFinishedCallback:)
     name:MPMoviePlayerPlaybackDidFinishNotification object:tmpMoviePlayViewController];

到这里：

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

【讨论】：

【解决方案2】：

您可以观察UIWindowDidBecomeVisibleNotification 和UIWindowDidBecomeHiddenNotification，如this post 中所述。这甚至适用于 iOS 8。

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowVisible:)
                                             name:UIWindowDidBecomeVisibleNotification
                                           object:self.view.window];
[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowHidden:)
                                             name:UIWindowDidBecomeHiddenNotification
                                           object:self.view.window];

- (void)windowVisible:(NSNotification *)notification
{
    NSLog(@"-windowVisible");
}

- (void)windowHidden:(NSNotification *)notification
{
    NSLog(@"-windowHidden");
}

【讨论】：

【解决方案3】：

我意识到这是一个老问题，但以上都没有解决我的问题。如果您最终像我一样尝试了所有方法，请确保您的父视图控制器没有使用相同的通知方法。我将通知发送到错误的地方。

将选择器名称更改为不常用的名称，然后重试。

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(MyMovieClosedThisTimeForReal:) name:MPMoviePlayerPlaybackDidFinishNotification object:nil];

【讨论】：

【解决方案4】：

确保

    moviePlayer.repeatMode = MPMovieRepeatModeNone;

【讨论】：

如果我通过MPMovieRepeatModeOne 那么我如何才能收到此通知？？
我想一遍又一遍地播放视频并在视频开始或结束播放时接收事件......

【解决方案5】：

我遇到了同样的问题。 This post救了我。如果视频全屏显示，请捕获 MPMoviePlayerDidExitFullscreenNotification 而不是 MPMoviePlayerPlaybackDidFinishNotification。我在下面捕获了两者，以防我以后改变主意。

- (void)videoButtonClick:(id)sender {
    MPMoviePlayerController* moviePlayerController = [[MPMoviePlayerController alloc] initWithContentURL:theVideoURL];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:) name:MPMoviePlayerDidExitFullscreenNotification object:moviePlayerController];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(moviePlayBackDidFinish:) name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayerController];
    [self.view addSubview:moviePlayerController.view];
    moviePlayerController.shouldAutoplay = YES;
    moviePlayerController.initialPlaybackTime = 0;
    moviePlayerController.scalingMode = MPMovieScalingModeAspectFit;
    moviePlayerController.fullscreen = YES;
    [moviePlayerController play];
}

- (void)moviePlayBackDidFinish:(NSNotification*)notification
{
    MPMoviePlayerController* moviePlayerController = notification.object;
    [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerPlaybackDidFinishNotification object:moviePlayerController];
    [[NSNotificationCenter defaultCenter] removeObserver:self name:MPMoviePlayerDidExitFullscreenNotification object:moviePlayerController];
    moviePlayerController.initialPlaybackTime = -1;
    [moviePlayerController stop];
    [moviePlayerController release];
}

【讨论】：

【解决方案6】：

同样的问题。想通了，当我发送nil 作为对象（而不是MoviePlayerController）时，回调被触发......

【讨论】：