title: iPhone UIImagePickerController problem: want to show UIActivityIndicatorView after hit "Use" button
body: <p>When Apple introduced version 3.0 of the iPhone OS the UIImagePickerController changed slighty: it no longer provides an activity or progress indicator after the user confirms a recently taken photo.  In a nutshell, you now
  - take a picture, 
  - decide it's ok and 
  - hit the "Use" button and wait.
  There is no indication as to whether you have actually hit the "Use" button or not.  Often, I hit it several times since I am unsure if I actually hit it or not.  After a few seconds, you see the image or the image becomes available via delegate connections, e.g. </p>
  
  <ul>
  <li>(void)imagePickerController:(UIImagePickerController *)picker 
  didFinishPickingMediaWithInfo:(NSDictionary *)info</li>
  </ul>
  
  <p>My question is this:
  - How do I display an UIActivityIndicatorView right after the "Use" button is selected? Or, how to I insert my own code by intercepting the "Use" button callback?  I've searched the web and expected many people to have the same problem but have not found a solution yet.</p>
  
  <p>Thanks.</p>