iphone - 删除 AVPlayerItem 观察者

Question

如果我使用 KVO 来观察我的播放器项目，如下所示:

    AVPlayerItem *playerItem = [AVPlayerItem playerItemWithURL:url];
    [playerItem addObserver:self forKeyPath:@"status" options:NSKeyValueObservingOptionNew context:MyClassKVOContext];
    [playerItem addObserver:self forKeyPath:@"playbackBufferEmpty" options:NSKeyValueObservingOptionNew context:MyClassKVOContext];
    [playerItem addObserver:self forKeyPath:@"playbackLikelyToKeepUp" options:NSKeyValueObservingOptionNew context:MyClassKVOContext];
    [playerItem addObserver:self forKeyPath:@"loadedTimeRanges" options:NSKeyValueObservingOptionNew context:MyClassKVOContext];

两个问题:

1) 项目播放完毕后，我是否需要删除我的观察者？ (即在 AVPlayerItemDidPlayToEndTimeNotification 中)

2) 如果我调用 [_avQueuePlayer removeAllItems] 是否也会删除每个项目的观察者？

Answer 1

全局创建你的播放器对象(AVPlayerItem *playerItem)并设置其属性并合成它。

1) 项目播放完毕后，我是否需要删除我的观察者？ (即在 AVPlayerItemDidPlayToEndTimeNotification 中)

Yes, your need to remove all observer when you are about to leave that view controller where that player is playing. Not after finishes playing.

2) 如果我调用 [_avQueuePlayer removeAllItems] 它是否也会删除每个项目的观察者？

Yes, it remove all observer that are set for that global variable.