Swift - 如何从相册加载视频并在收藏视图中显示它们

Question

我使用PHImageManager 从相册加载图像。 这是我的代码...

var photoLibrary = [UIImage]()
    func grabPhotos(){
        let imgManager = PHImageManager.default()

        let requestOptions = PHImageRequestOptions()
        requestOptions.isSynchronous = true
        requestOptions.deliveryMode = .highQualityFormat

        let fetchOptions = PHFetchOptions()
        fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
        if let fetchResult : PHFetchResult = PHAsset.fetchAssets(with: .image, options: fetchOptions) {
            if fetchResult.count > 0 {
                for i in 0..<fetchResult.count{
                    imgManager.requestImage(for: fetchResult.object(at: i) as PHAsset , targetSize: CGSize(width: 200, height: 200), contentMode: .aspectFill, options: requestOptions, resultHandler: {
                        image, error in
                        self.photoLibrary.append(image!)
                    })
                }
            }
            else{
                showAllertToImportImage()//A function to show alert
            }
        }
    }

现在我想从相册加载视频，我需要在UICollectionView 中显示它们。 为了在UICollectionView 中加载图像，我在单元格中使用了UIImageView。我应该在单元格中使用什么来加载视频？ 我还需要显示视频时长。

Answer 1

请查看获取视频和视频时长的答案

  func grabPhotos(){
    let imgManager = PHImageManager.default()

    let requestOptions = PHImageRequestOptions()
    requestOptions.isSynchronous = true
    requestOptions.deliveryMode = .highQualityFormat

    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]
    if let fetchResult : PHFetchResult = PHAsset.fetchAssets(with: .video, options: fetchOptions) {
        if fetchResult.count > 0 {
                for i in 0..<fetchResult.count{

 //Used for fetch Image//
imgManager.requestImage(for: fetchResult.object(at: i) as PHAsset , targetSize: CGSize(width: 200, height: 200), contentMode: .aspectFill, options: requestOptions, resultHandler: {
                    image, error in
                    let imageOfVideo = image! as UIImage
                    self.photoLibrary.append(imageOfVideo)
                })
  //Used for fetch Video//
 imgManager.requestAVAsset(forVideo: fetchResult.object(at: i) as PHAsset, options: PHVideoRequestOptions(), resultHandler: {(avAsset, audioMix, info) -> Void in
                    if let asset = avAsset as? AVURLAsset {
                        //let videoData = NSData(contentsOf: asset.url)
                        let duration : CMTime = asset.duration
                       let durationInSecond = CMTimeGetSeconds(duration)
                        print(durationInSecond)
                    }



                })
            }

        }
        else{
            //showAllertToImportImage()//A function to show alert
        }
    }
}