title: Custom UIActivity with the built-in Mail appearance
body: <p>I wish to use a UIActivityController with the standard activities to share a UIImage. However when the user selects Mail I'd like to do my own logic: present a form to let the user select a few options, and then compose the email myself so that I can add my own body and attachments to the email.</p>
  
  <p>Is there a way to achieve this?</p>
  
  <p>I understand that I can create a custom UIActivity, but then I'll have to provide a custom image which will be displayed in gray, and the standard Mail icon would be much more recognizable.</p>