swift PhotoKit 摸石头过河

最近老板突发奇想,要求要在系统相册中创建一个自定义相册,用来保存所有从我们App中下载的视频,并且要能满足随时添加删除的功能.

我的内心是崩溃的.......
研究多天以后终于有一点进展 参考了以下两位的博客写的OC内容

http://www.jianshu.com/p/ea0274a33209
http://www.jianshu.com/p/ddd4bd3d6136

//        获取所有用户自定义的相册
        let userCollections : PHFetchResult = PHCollectionList.fetchTopLevelUserCollectionsWithOptions(nil)
//        获取相册名称
        for index : Int in 0..<userCollections.count {
            let collection = userCollections.objectAtIndex(index) as! PHAssetCollection
            if collection.localizedTitle == "UserName" {
//                获取相册信息
                let assetsResult : PHFetchResult = PHAsset.fetchAssetsWithMediaType(.Video, options: nil)
                let option : PHVideoRequestOptions = PHVideoRequestOptions.init()
                option.deliveryMode = .Automatic
                for index : Int in 0..<assetsResult.count {
                    let a : PHAsset = assetsResult.objectAtIndex(index) as! PHAsset
                    PHImageManager.defaultManager().requestAVAssetForVideo(a, options: option, resultHandler: { (asset, audioMix, info) in
                        
                        let a = (asset! as! AVURLAsset)
                        print(a.URL.relativePath)
                        
//                        print(audioMix)
                        print(info)
                    })
                }
            }
        }