rx.swift

/**
     Create and return an album in the Photos app with a specified name. Won't overwrite if such an album already exist.
     
     - parameter named:      Name of the album.
     - parameter completion: Called in the background when an album was created.
     */
    public static func createAlbum(named: String, completion: (album: PHAssetCollection?) -> ()) {
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0)) {
            var placeholder: PHObjectPlaceholder?
            
            PHPhotoLibrary.sharedPhotoLibrary().performChanges({
                let createAlbumRequest = PHAssetCollectionChangeRequest.creationRequestForAssetCollectionWithTitle(named)
                placeholder = createAlbumRequest.placeholderForCreatedAssetCollection
            }) { success, error in
                var album: PHAssetCollection?
                if success {
                    let collectionFetchResult = PHAssetCollection.fetchAssetCollectionsWithLocalIdentifiers([placeholder?.localIdentifier ?? ""], options: nil)
                    album = collectionFetchResult.firstObject as? PHAssetCollection
                }
                
                completion(album: album)
            }
        }
    }