title: How to add empty cells in UITableView without expanding it
body: <p>I have UITableView with custom looking cells. Now user can scroll past the bottom and see that there are no more rows (cells) and see background. I want to create impression that there are more rows below, but they should not be added to tableview, so when user scrolls down, it bounces back to last useful cell.
  TableFooter and subview expands content and user can scroll there (or maybe I was doing it wrong).</p>
  
  <p>Right now I added new empty cells and after any action that may recount contentSize I specifically set contentSize to default setting. But I feel like it's not the right way (although it works). Is there some other way? </p>
  
  <p>I tried searching, but it's hard to explain what I want in few sentences, not to mention in search line.</p>