アプリ用の写真を格納するために PHAssetCollection を作成しましたが、正常に動作します。ただし、ユーザーがボタンを押したときに PHAssetCollection を削除できるようにしようとしています。次のコードで作成した AssetCollection (「アプリ フォルダー」) 全体を削除するにはどうすればよいですか?
PHAssetCollection を作成するコード:
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
}
})
}