我创建了一个 PHAssetCollection 来存放我的应用程序的照片,它工作正常。但是,我试图拥有它,以便用户在按下按钮时可以删除 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
}
})
}