ios - 删除 PHAssetCollection (Swift)

Question

我创建了一个 PHAssetCollection 来为我的应用程序存放我的照片，它工作正常。但是，我试图拥有它，以便用户可以在按下按钮时删除 PHAssetCollection。如何删除我在以下代码中创建的整个 AssetCollection(“应用程序文件夹”)？

创建 PHAssetCollection 的代码:

    let albumName = "App Folder" 

    //Check if the folder exists, if not, create it
    let fetchOptions = PHFetchOptions()
    fetchOptions.predicate = NSPredicate(format: "title = %@", albumName)
    let collection:PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(.Album, subtype: .Any, options: fetchOptions)

    if let first_Obj:AnyObject = collection.firstObject{
        //found the album
        self.albumFound = true
        self.assetCollection = first_Obj as! PHAssetCollection
    }else{
        //Album placeholder for the asset collection, used to reference collection in completion handler
        var albumPlaceholder:PHObjectPlaceholder!
        //create the folder
        NSLog("\nFolder \"%@\" does not exist\nCreating now...", albumName)
        PHPhotoLibrary.sharedPhotoLibrary().performChanges({
            let request = PHAssetCollectionChangeRequest.creationRequestForAssetCollectionWithTitle(albumName)
            albumPlaceholder = request.placeholderForCreatedAssetCollection
            },
            completionHandler: {(success:Bool, error:NSError!)in
                if(success){
                    println("Successfully created folder")
                    self.albumFound = true
                    if let collection = PHAssetCollection.fetchAssetCollectionsWithLocalIdentifiers([albumPlaceholder.localIdentifier], options: nil){
                        self.assetCollection = collection.firstObject as! PHAssetCollection
                    }
                }else{
                    println("Error creating folder")
                    self.albumFound = false
                }
        })

    }

Answer 1

    PHPhotoLibrary.sharedPhotoLibrary().performChanges({ () -> Void in

    PHAssetCollectionChangeRequest.deleteAssetCollections([self.deleteTarget])

    }, completionHandler: nil)