如何检测MPMoviePlayerController开始播放电影？

Question

我正在使用MPMoviePlayerController，我如何检测电影实际开始播放的时间——而不是用户操作寻找控制器的时间？

根据我的测试，每当电影开始时，我总是会收到“加载状态更改”事件，并且(moviePlayer.loadState == MPMovieLoadStatePlayable)在用户操作寻找控制器时也是TRUE（即使他从结尾拖动到中间-不一定要到电影的开头）。那我如何区分电影开始和寻找控制器？

- Sagi Mann

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也许这个链接有帮助？ - AlexR

请查看此链接：https://dev59.com/zm025IYBdhLWcg3wzZT3 - karthika

Answer 1

    MPMoviePlaybackState
    Constants describing the current playback state of the movie player.
    enum {
       MPMoviePlaybackStateStopped,
       MPMoviePlaybackStatePlaying,
       MPMoviePlaybackStatePaused,
       MPMoviePlaybackStateInterrupted,
       MPMoviePlaybackStateSeekingForward,
       MPMoviePlaybackStateSeekingBackward
    };
    typedef NSInteger MPMoviePlaybackState;

注册MPMoviePlayerPlaybackStateDidChangeNotification通知

[[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(MPMoviePlayerPlaybackStateDidChange:) 
                                                 name:MPMoviePlayerPlaybackStateDidChangeNotification 
                                               object:nil];

检查此函数中的MPMoviePlaybackState

- (void)MPMoviePlayerPlaybackStateDidChange:(NSNotification *)notification
    {
      if (player.playbackState == MPMoviePlaybackStatePlaying)
      { //playing
      }
      if (player.playbackState == MPMoviePlaybackStateStopped)
      { //stopped
      }if (player.playbackState == MPMoviePlaybackStatePaused)
      { //paused
      }if (player.playbackState == MPMoviePlaybackStateInterrupted)
      { //interrupted
      }if (player.playbackState == MPMoviePlaybackStateSeekingForward)
      { //seeking forward
      }if (player.playbackState == MPMoviePlaybackStateSeekingBackward)
      { //seeking backward
      }

}

通过以下方式移除通知：

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

参考：MPMoviePlaybackState

- Vivek Sehrawat

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这也可以检测到从暂停状态恢复 - 不仅仅是当电影实际开始时。 - Sagi Mann

Answer 2

对于 Swift

添加观察者

let defaultCenter: NSNotificationCenter = NSNotificationCenter.defaultCenter()
defaultCenter.addObserver(self, selector: "moviePlayerPlaybackStateDidChange:", name: MPMoviePlayerPlaybackStateDidChangeNotification, object: nil)

功能

func moviePlayerPlaybackStateDidChange(notification: NSNotification) {
        let moviePlayerController = notification.object as! MPMoviePlayerController

        var playbackState: String = "Unknown"
        switch moviePlayerController.playbackState {
        case .Stopped:
            playbackState = "Stopped"
        case .Playing:
            playbackState = "Playing"
        case .Paused:
            playbackState = "Paused"
        case .Interrupted:
            playbackState = "Interrupted"
        case .SeekingForward:
            playbackState = "Seeking Forward"
        case .SeekingBackward:
            playbackState = "Seeking Backward"
        }

        print("Playback State: %@", playbackState)
    }

- Hardik Thakkar

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我在实际开始播放之前就得到了“正在播放”的状态。有没有什么方法可以处理它？ - MobileGeek