ios - AVQueuePlayer AVPlayerItemDidPlayToEndTimeNotification 调用失败

Question

我使用 AVQueuePlayer 循环遍历 AVPlayerItems 数组。我循环它的方式是听 AVPlayerItemDidPlayToEndTimeNotification，每次调用它时，我都会将当前对象添加到队列的末尾。代码如下:

    viewWillAppear
{
    ...

    [[NSNotificationCenter defaultCenter] addObserver:self
                                                 selector:@selector(playerItemDidReachEnd:)
                                                     name:AVPlayerItemDidPlayToEndTimeNotification
                                                   object:[_queuePlayer currentItem]];

        [_queuePlayer play];
}
- (void)playerItemDidReachEnd:(NSNotification *)notification {
    AVPlayerItem *p = [notification object];
    AVPlayerItem *fakeNew = [[AVPlayerItem alloc] initWithAsset:p.asset];
    if (_queuePlayer.items.count == 1)
    {
        [p seekToTime:kCMTimeZero];
        [_queuePlayer play];
    }
    else
    {
        [_queuePlayer insertItem:fakeNew afterItem:[_queuePlayer.items lastObject]];
    }
    NSLog(@"array of items to play:%lu", (unsigned long)_queuePlayer.items.count);

}

问题是，该方法仅针对播放的第一个视频调用，之后，该方法停止被调用，因此，例如，如果我在数组中有 2 部电影，它将同时播放它们+第一个再次，知道为什么会发生这种情况吗？

更多信息:还尝试每次都制作一个新的播放器并将其设置为分层。多次发送通知失败都一样

- (void)playerItemDidReachEnd:(NSNotification *)notification {
    AVPlayerItem *p = [notification object];
    [self.playList removeObjectAtIndex:0];
    [self.playList addObject:p];
    AVPlayer *newPlayer = [[AVPlayer alloc] initWithPlayerItem:[self.playList objectAtIndex:0]];
    _player = newPlayer;
    self.AVPlayerLayerView.layer.player = self.player;
    [_player play];

}

Answer 1

经过一番困惑之后，显然出于某种原因， View 每次都未注册为观察者，我只是在每次通知后删除并添加了观察者:

- (void)playerItemDidReachEnd:(NSNotification *)notification {
    AVPlayerItem *p = [notification object];
    AVPlayerItem *fakeNewItem = [[AVPlayerItem alloc] initWithAsset:p.asset];
    [self.playList removeObjectAtIndex:0];
    [self.playList addObject:fakeNewItem];
    AVPlayer *newPlayer = [[AVPlayer alloc] initWithPlayerItem:[self.playList objectAtIndex:0]];
    _player = newPlayer;
    self.AVPlayerLayerView.layer.player = self.player;
    [[NSNotificationCenter defaultCenter] removeObserver:self];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(playerItemDidReachEnd:)
                                                 name:AVPlayerItemDidPlayToEndTimeNotification
                                               object:[_player currentItem]];
    [_player play];

}