AVPlayer 在 iOS7 中不顯示視頻，在 iOS8 和 iOS9 上工作正常

Question

這是我的代碼

@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

這真的不應該在任何 iOS 版本上工作

AVPlayer *avPlayer = [AVPlayer playerWithPlayerItem:playerItem];

超出范圍並在viewDidAppear結束時被釋放。

您應該將AVPlayer分配給類成員變量，以阻止這種情況發生。

否則視頻文件可能有問題。

Answer 2

您的 AVPlayer 項目需要一個強引用，因為它會自動設置為 nil

請更換

@interface ViewController ()

{
    AVPlayer *avPlayer;
}
@end

對此

@interface ViewController ()  
@property (strong, nonatomic) AVPlayer *avPlayer;
@end

並將所有avPlayer引用更改為self.avPlayer我希望這會avPlayer幫助。