ios - Swift - 如何获取 .Mov 格式？

Question

我找到了很多关于使用

获取视频或图像的解决方案

phfetchOptions.predicate = NSPredicate(format : "mediaType = %d" , PHAssetMediaType.video.rawvalue)

还有一个 PHAssetMediaSubtype，它与我正在寻找的完全不同。

如何准确地获取 PHAsset 中所有其他格式的 .Mov 文件的数量

我接近了解决方案，但我想这不是获取计数的正确方法。视频数量创建后台调用数量而不是该过程应该在一个异步调用中完成。有什么建议吗？

 private func getMovVideosCount() {

    let fetchOptions = PHFetchOptions()

    fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.video.rawValue)
    var count : Int = 0
    let imagesAndVideos = PHAsset.fetchAssets(with: fetchOptions)
    for i in 0..<imagesAndVideos.count {
        let videoRequestOptions = PHVideoRequestOptions()
        PHImageManager.default().requestPlayerItem(forVideo: imagesAndVideos[i], options: videoRequestOptions) { (playerItem, result) in
            let currentVideoUrlAsset = playerItem?.asset as?  AVURLAsset
            if let currentVideoFilePAth = currentVideoUrlAsset?.url{
                let lastObject = currentVideoFilePAth.pathExtension
                if lastObject == "MOV" {
                    count += 1
                }
            }
            print(Thread.isMainThread) // false 
        }
    }
    print(Thread.isMainThread) // true
}

Answer 1

这个解决方案给出了.MOV的计数并解决了dispatch group的并发问题。

private func getMovVideosCount() {

let fetchOptions = PHFetchOptions()
let dispatchgroup = DispatchGroup()
fetchOptions.predicate = NSPredicate(format: "mediaType = %d", PHAssetMediaType.video.rawValue)
var count : Int = 0
let imagesAndVideos = PHAsset.fetchAssets(with: fetchOptions)
for i in 0..<imagesAndVideos.count {
    dispatchgroup.start()
    let videoRequestOptions = PHVideoRequestOptions()
    PHImageManager.default().requestPlayerItem(forVideo: imagesAndVideos[i], options: videoRequestOptions) { (playerItem, result) in
        let currentVideoUrlAsset = playerItem?.asset as?  AVURLAsset
        if let currentVideoFilePAth = currentVideoUrlAsset?.url{
            let lastObject = currentVideoFilePAth.pathExtension
            if lastObject == "MOV" {
                count += 1
            }
        }
        print(Thread.isMainThread) // false 
      dispatchgroup.leave()
    }
}
dispatchgroup.notify({})
print(Thread.isMainThread) // true