title: UITableView Header shows content behind it
body: <p>I have a UITableView with headings on top of a textured background.  I want the header to stick at the top, which they do, but I don't want the cells to show behind it as they go by.  Here is an example:</p>
  
  <p><img src="https://i.stack.imgur.com/9A2z2.png" alt="UITableView image"></p>
  
  <p>New Content is the header.  You can see the rows of data under it as they scroll by.  I can't set the background of the header because it has to show the texture from the window behind it.  How can I not show the rows underneath the header?</p>