title: How can I use scrollRectToVisible to scroll to the center of an image?
body: <p>I have a UIScrollView with zooming and panning. I want the image to scroll to the center after a user command. My problem is in calculating the size and location of a frame that is in the center of the image.</p>
  
  <p>Does anyone know how to calculate the correct frame for the center of my image? The problem is that if the zoomScale is different the frame changes.</p>
  
  <p>Thanks!</p>