了解MPMoviePlayerController当前是否正在播放

Question

我有一个关于MPMoviePlayerController的小问题,当我点击那个电影按钮时我有一个播放电影的链接,但是当我点击另一个按钮应用程序崩溃时,我需要找到如何识别该电影正在播放或获得任何类型回应

Answer 1

要扩展@ Saurabh的答案,您可以检查视频是否正在播放

if(player.playbackState == MPMoviePlaybackStatePlaying)
{
// is Playing
}

在哪里MPMoviePlaybackState定义为

enum {
   MPMoviePlaybackStateStopped,
   MPMoviePlaybackStatePlaying,
   MPMoviePlaybackStatePaused,
   MPMoviePlaybackStateInterrupted,
   MPMoviePlaybackStateSeekingForward,
   MPMoviePlaybackStateSeekingBackward
};
typedef NSInteger MPMoviePlaybackState;

Answer 2

有两部分,通常组合使用;

注册MPMoviePlayerPlaybackStateDidChangeNotification例如:

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

在通知处理程序中,您可以详细检查实际状态 - 例如:

- (void)MPMoviePlayerPlaybackStateDidChange:(NSNotification *)notification
{
  //are we currently playing?
  if (movieController_.playbackState == MPMoviePlaybackStatePlaying)
  { //yes->do something as we are playing...
  }
  else 
  { //nope->do something else since we are not playing
  }
}

您当然也可以使用playbackState属性,而无需处理发出更改信号的通知.不过,在大多数情况下,这是正确的地方.

删除/删除电影播放时,不要忘记删除通知处理程序,例如:

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