title: Scrolling to a rect when UIScrollView is zoomed?
body: <p>I have an UIImageView with an image (map) inside of a UIScrollView.  I add another image (marker) to the image view (so a map background and a marker).  If the marker isn't shown on the screen, when I place the marker I want to scroll to show the marker.</p>
  
  <p>I'm using <code>[scrollView scrollRectToVisible:rect animated:YES]</code> after I place the marker on the map.  This works great when the scrollview isn't zoomed.  How do I adjust <code>rect</code> based on the zoom scale so the marker is centered in the view?</p>