Question

我在iOS上生成视频缩略图列表：

 override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    // get a reference to our storyboard cell
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath as IndexPath)
    cell.backgroundColor = UIColor.red

    // Use the outlet in our custom class to get a reference to the UILabel in the cell
    let imageView = UIImageView(frame: CGRect(x:0, y:0, width:cell.frame.size.width, height:cell.frame.size.height))
    let image = uiImageArray[indexPath.row]
    imageView.image = image
    imageView.contentMode = UIViewContentMode.scaleAspectFit

    cell.addSubview(imageView)
    return cell
}

当用户点击图片我想播放视频时：

  override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
    // handle tap events
    print("You selected cell #\(indexPath.item)!")
    self.assetToNav = indexPath.item
    let data = self.assestArray[self.assetToNav]

    self.playVideo(view: self, videoAsset: data)
}
  func playVideo (view: UIViewController, videoAsset: PHAsset) {

        guard (videoAsset.mediaType == .video) else {
            print("Not a valid video media type")
            return
        }

        PHCachingImageManager().requestAVAsset(forVideo: videoAsset, options: nil) { (asset, audioMix, args) in
            let asset = asset as! AVURLAsset

            DispatchQueue.main.async {
                let player = AVPlayer(url: asset.url)
                let playerViewController = VideoPlayerViewController()
                playerViewController.player = player
                view.present(playerViewController, animated: true) {
                    playerViewController.player!.play()
                }
            }
        }
    }

当视频开始播放时，我会在控制台错误中看到：

[framework] CUICatalog：提供的资产名称无效：'（null）'

我是初学者，快速编程，请帮忙

CUICatalog：提供无效的资产名称：播放视频时为“（null）”

0 个答案: