title: Copy image from assets-library to an app folder
body: <p>I have an UIImagePickerController and I would like to save a selected image to my app. I can do that easy by getting the current UIImage and save it (by creating a file) but I would prefer to directly copy the file from Library to my folder.
  So now I have an URL of the selected image : UIImagePickerControllerReferenceURL which return a specific  pattern "assets-library". I tried to copy an image from this kind of URL to a path but without success. </p>
  
  <p>Is there a way to success on what I would like to do ?
  Thanks !</p>