 
 @available(iOS 9.0, *)
 private extension PHAsset {
-
+    
     static func fetchLastScreenshot() -> PHAsset? {
         let options = PHFetchOptions()
         

        }
    }
    
    private func findScreenshot() {
        guard let screenshot = PHAsset.fetchLastScreenshot() else { fail(with: .fetchFailure); return }
        
        // Fall back to the `.default()` image manager if an image manager wasn’t set on initialization.

     - parameter notificationCenter: A notification center that will listen for screenshot notifications.
     - parameter application:        An application that will be the `object` of the notification observer.
     - parameter imageManager:       An image manager used to fetch the image data of the screenshot. If `nil`, the `default()` image manager will be used.
     - parameter photoLibrary:       The photo library used for detecting a change event after a screenshot is taken. Defaults to `.shared()`.
     */
    public init(delegate: ScreenshotDetectorDelegate, notificationCenter: NotificationCenter = .default, application: UIApplication = .shared, imageManager: PHImageManager? = nil, photoLibrary: PHPhotoLibrary = .shared()) {
        self.delegate = delegate
        self.notificationCenter = notificationCenter
        self.application = application
        self.imageManager = imageManager
        self.photoLibrary = photoLibrary
        
        super.init()
        
