title: UIScrollView ContentSize Not Behaving as Expected
body: <p>Im a little bit confused by the <code>contentSize</code> property in <code>UIScrollView</code>. I have an image in my scrollView that I'm zooming and panning. I have been playing around with different values for <code>contentSize</code>, but it seems to me that it doesn't really matter what values I enter, the <code>contentSize</code> is always set to the size of the image. Ive noted that this only happens when I have performed a zoom. Before I zoom, the contentSize maintains the values that I set, but after zooming, <code>contentSize</code> sets itself to the size of the image.</p>
  
  <p>Am I misunderstanding something?</p>