title: iOS SearchDisplayController prevents tableview from background color change (background stays gray)
body: <p>This might be a bug in iOS 7:
  I used storyboard to drag in <strong>Search Bar and Search Display Controller</strong> in my tableview controller. The background color of my tableview is altered after that.
  I am using an example from AppCoda's "how-to-add-search-bar-uitableview" to demo this issue. I only changed the example code with 1-line add-on in <code>ViewDidLoad</code>:</p>
  
  <pre><code>   [_tableView setBackgroundColor:[UIColor blackColor]];
  </code></pre>
  
  <p>See my screenshots here:</p>
  
  <ol>
  <li><p>The bottom of the tableview has already changed to black: 
  <img src="https://i.stack.imgur.com/77OJD.png" alt="enter image description here"></p></li>
  <li><p>But the top stays as gray though tableview's background was set to black: <img src="https://i.stack.imgur.com/0RIdX.png" alt="enter image description here">
  This only happens when I drag in "Search Bar and Search Display Controller". If I remove the "Search Display Controller" from storyboard, it's all good.</p></li>
  </ol>