ios - AVPlayer 在 iOS7 中不显示视频，在 iOS8 和 iOS9 上工作正常

Question

这是我的代码，

@interface ViewController ()
{
    AVPlayer *avPlayer;
}
@end

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    UIView *containerView = [[UIView alloc] initWithFrame:self.view.frame];
    NSString *filepath = [[NSBundle mainBundle] pathForResource:@"TestVideo" ofType:@"mp4"];
    AVAsset *asset = [AVAsset assetWithURL:[NSURL fileURLWithPath:filepath]];
    AVPlayerItem *playerItem = [[AVPlayerItem alloc] initWithAsset:asset];
    avPlayer = [AVPlayer playerWithPlayerItem:playerItem];
    AVPlayerLayer *avPlayerLayer = [AVPlayerLayer playerLayerWithPlayer:avPlayer];

    avPlayerLayer.frame = self.view.frame;
    [containerView.layer addSublayer:avPlayerLayer];
    [self.view addSubview:containerView];
    [avPlayer play];
}

Answer 1

这确实不应该在任何 iOS 版本上工作

AVPlayer *avPlayer = [AVPlayer playerWithPlayerItem:playerItem];

超出范围并在viewDidAppear结束时被释放。

您应该将 AVPlayer 分配给类成员变量，以阻止这种情况发生。

否则视频文件可能有问题。