title: Editing existing image with UIImagePickerController
body: <p>Is it possible to use the <code>UIImagePickerController</code> to edit an image in an <code>UIImageView</code>? I am able to take and pick a picture but I want to use the imagepicker's edit mode to edit an image I have already picked and show on a view.</p>
  
  <pre><code>imagePicker = nil
          imagePicker =  UIImagePickerController()
          imagePicker.delegate = self
          imagePicker.allowsEditing = true
          imagePicker.sourceType = .photoLibrary
          present(imagePicker, animated: true, completion: nil)
  </code></pre>