MPMoviePlayerViewController 完成按钮不起作用答案

【问题标题】：MPMoviePlayerViewController done button not workingMPMoviePlayerViewController 完成按钮不起作用
【发布时间】：2017-02-16 08:26:40
【问题描述】：

我有一个地方允许用户从 UIImagePicker 中选择视频，然后通过 MPMoviePlayerViewController 播放该视频。这工作正常，除非按下完成按钮时它只是暂停视频并且不会从全屏关闭它。我被引导相信完成按钮的默认行为是关闭视频，所以我不确定是什么阻止它这样做，或者我可以改变什么来实现它。这是我当前的代码，我尝试了一些更改，我会在代码后记下。

NSString* mediaType = [info objectForKey:UIImagePickerControllerMediaType];

if(CFStringCompare((CFStringRef) mediaType,  kUTTypeMovie, 0) == kCFCompareEqualTo)
{
    videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
}

moviePlayer =  [[MPMoviePlayerViewController alloc] initWithContentURL:videoURL];
[moviePlayer.view setTranslatesAutoresizingMaskIntoConstraints:YES];
moviePlayer.moviePlayer.scalingMode = MPMovieScalingModeAspectFit;

[self.view addSubview:moviePlayer.view];

- (void) moviePlayBackDidFinish:(NSNotification*)notification
{
[[NSNotificationCenter defaultCenter] removeObserver:self
                                                name:MPMoviePlayerDidExitFullscreenNotification
                                              object:nil];

[moviePlayer.moviePlayer stop];
[moviePlayer.view removeFromSuperview];
}

我尝试将 [self.view addSubview:moviePlayer.view]; 更改为 [self presentMoviePlayerViewControllerAnimated:]; 但这无济于事。我已经提出了几个不同的变体：

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(moviePlayBackDidFinish:)
                                             name:MPMoviePlayerDidExitFullscreenNotification
                                           object:moviePlayer];

使用其余的初始化代码，但这也无济于事。

编辑：如果允许视频一直播放到最后，它也不会关闭，它只是全屏卡在视频播放器中。

【问题讨论】：

标签： ios mpmovieplayercontroller

【解决方案1】：

添加观察者时，对象参数应该是moviePlayer.moviePlayer，而不仅仅是moviePlayer。

moviePlayer.moviePlayer（MPMoviePlayerController 类）是发送通知的那个，而不是moviePlayer（MPMoviePlayerViewController 类）。

所以改变这个：

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

到这里：

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

【讨论】：

【解决方案2】：

对于 Swift 3，这对我有用：

//register the observer
override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(CameraSetupViewController.moviePlayerDoneButtonClicked), name: NSNotification.Name.MPMoviePlayerPlaybackDidFinish, object: nil)

        moviePlayerPlay()
}

//moviePlayer play function
func moviePlayerPlay() {
     let url:NSURL = NSURL( string: "https://tendinsights.com/Video.mp4" )

     if let movieViewController = MPMoviePlayerViewController( contentURL: url as URL! ) 
           self.presentMoviePlayerViewControllerAnimated(movieViewController)
                movieViewController.moviePlayer.play()       
     }
}

//moviePlayer Done Button Pressed
func moviePlayerDoneButtonClicked(_ notification: NSNotification) {        
    let reason = notification.userInfo?[MPMoviePlayerPlaybackDidFinishReasonUserInfoKey]

    if (MPMovieFinishReason(rawValue: reason as! Int) == MPMovieFinishReason.userExited) {
        self.dismiss(animated: true, completion: nil)
    }
}

【讨论】：