title: iOS saving photo to Camera Roll does not preserve EXIF/GPS metadata
body: <p>I know a UIImage can be saved into Camera Roll with <code>UIImageWriteToSavedPhotosAlbum</code>, but this approach strips all metadata from the original file (EXIF, GPS data, etc). Is there any way to save the original file, rather than just the image data into the iOS device's Camera Roll?</p>
  
  <p>Edit: I guess I should have been a bit more specific. The aim is to save a duplicate of an existing JPEG file into a user's Camera Roll. What's the most efficient way to do this?</p>