title: After resizing view inside UIScrollView, the scroll view does not know it changed
body: <p>I resized the view that I put into a UIScrollView, but the scroll view does not know that the size changed.</p>
  
  <p>So, I tried removing the view and re-adding it to the UIScrollView, but that did not help.</p>
  
  <p>How can I convince the UIScrollView that its contents have changed size?</p>
  
  <p>Thanks.</p>