丰富的推送通知 - 视频不会在通知内容扩展中播放

我正在研究丰富的通知Notification Content Extension并且能够加载images and gif成功如下面截图：

现在我正在尝试播放视频，并且正在执行以下代码来播放它。

- (void)didReceiveNotification:(UNNotification *)notification {
    //self.label.text = @"HELLO world";//notification.request.content.body;

    if(notification.request.content.attachments.count > 0)
    {

        UNNotificationAttachment *Attachen = notification.request.content.attachments.firstObject;


        NSLog(@"====url %@",Attachen.URL);
        AVAsset *asset = [AVAsset assetWithURL:Attachen.URL];
        AVPlayerItem *item = [AVPlayerItem playerItemWithAsset:asset];

        AVPlayer  *player = [AVPlayer playerWithPlayerItem:item];
        AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
        playerLayer.contentsGravity = AVLayerVideoGravityResizeAspect;
        player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
        playerLayer.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);

            [self.VideoPlayerView.layer addSublayer:playerLayer];
        [player play];
    }
}

在 NSLog 中我也得到了视频的文件 url。但这不会发挥作用。如果有人有该解决方案，请提供帮助。

Thanks.

我在代码中犯了一个非常小的错误。我们必须核实startAccessingSecurityScopedResource如果我执行如下代码

- (void)didReceiveNotification:(UNNotification *)notification {

    if(notification.request.content.attachments.count > 0)
    {
            UNNotificationAttachment *Attachen = notification.request.content.attachments.firstObject;

            if(Attachen.URL.startAccessingSecurityScopedResource)
            {

                NSLog(@"====url %@",Attachen.URL);
                AVAsset *asset = [AVAsset assetWithURL:Attachen.URL];
                AVPlayerItem *item = [AVPlayerItem playerItemWithAsset:asset];

                AVPlayer  *player = [AVPlayer playerWithPlayerItem:item];
                AVPlayerLayer *playerLayer = [AVPlayerLayer playerLayerWithPlayer:player];
                playerLayer.contentsGravity = AVLayerVideoGravityResizeAspect;
                player.actionAtItemEnd = AVPlayerActionAtItemEndNone;
                playerLayer.frame = CGRectMake(0, 0, self.VideoPlayerView.frame.size.width, self.VideoPlayerView.frame.size.height);

                [self.VideoPlayerView.layer addSublayer:playerLayer];
                [player play];

            }                
        }
}

视频正在播放。嘘……