AVPlayer不保留AVPlayerItem

Question

有人知道为什么这段代码会在发布池中的某个地方崩溃(在调用'eject‘之后)吗？我在AVPlayer类引用中看到，'currentItem‘属性没有声明为'retain’http://developer.apple.com/library/ios/documentation/AVFoundation/Reference/AVPlayer_Class/Reference/Reference.html#//apple_ref/doc/uid/TP40009530-CH1-SW21

它是AVPlayer类中的一个bug，还是应该将它保留在其他地方？

谢谢!

- (void) viewDidLoad {
    NSURL *url = [NSURL URLWithString:@"http://devimages.apple.com/iphone/samples/bipbop/bipbopall.m3u8"];
    playerItem = [[AVPlayerItem alloc] initWithURL:url];
    player = [[AVPlayer alloc] initWithPlayerItem:playerItem];
}

- (IBAction) eject {
    [player release];
    [playerItem release];
}

Answer 1

我通常使用下面的代码来设置播放器：

if (!self.player) {
    player = [[AVPlayer alloc] init];
    }

    [self.player replaceCurrentItemWithPlayerItem:[AVPlayerItem playerItemWithURL:videoURL]];

Answer 2

我相信AVPlayer在initWithPlayerItem: function中保留了AVPlayerItem，所以您的AVPlayerItem可能会泄漏内存。"currentItem“是只读属性，不应该是"retain”，因为它只适用于可写属性。