既然不推荐使用MPMoviePlayerPlaybackDidFinishReasonUserInfoKey，那么找到回放结束原因的最佳方法是什么？

Question

在iOS9中，MPMoviePlayer类已全部弃用，转而支持AVPlayer。我有一个使用MPMoviePlayerPlaybackDidFinishReasonUserInfoKey的现有应用程序来确定如何记录视频播放器结束的事件。我如何对AVPlayer做同样的事情？

以下是结束原因键：

• MPMovieFinishReasonPlaybackEnded
• MPMovieFinishReasonPlaybackError
• MPMovieFinishReasonUserExited

Answer 1

AVKit中没有与MPMoviePlayerPlaybackDidFinishReasonUserInfoKey和MPMoviePlayerPlaybackDidFinishNotification等效的内容。要在AVKit中完成相同的功能，您必须单独收听三个通知，而不是一个通知，原因可能不同。

• MPMovieFinishReasonPlaybackEnded＆gt;＆gt;＆gt; AVPlayerItemDidPlayToEndTimeNotification
• MPMovieFinishReasonPlaybackError＆gt;＆gt;＆gt; AVPlayerItemFailedToPlayToEndTimeNotification
• MPMovieFinishReasonUserExited。没有转换。有多种方法可以检测用户是否杀死了播放器。一个是检测模态已关闭。

如果您想知道视频是否正在播放，您可以进行KVO：

[self.player addObserver:self forKeyPath:@"rate" options:0 context:nil];

然后添加此方法：

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context 
{
    if ([keyPath isEqualToString:@"rate"]) {
        if ([self.player rate]) {
            [self changeToPause];  // This changes the button to Pause
        }
        else {
            [self changeToPlay];   // This changes the button to Play
        }
    }
}

Answer 2

尝试viewDidLoad：

    AVPlayerItem* playerItem = [AVPlayerItem playerItemWithURL:[NSURL URLWithString:@"yoururl"]];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(itemDidFinishPlaying:) name:AVPlayerItemDidPlayToEndTimeNotification object:playerItem];

    AVPlayer* player = [[[AVPlayer alloc] initWithPlayerItem:playerItem] autorelease];

    [player play]

和

-(void)itemDidFinishPlaying:(NSNotification *) notification {
    // Will be called when AVPlayer finishes playing playerItem
}