title: Searchbar disappears when typing
body: <p>My application (iOS deployment target 8.2) shows a searchable table view. I use a Search Bar and Search Display Controller. The searching works (the table updates) but I have a very annoying visual bug that I can't seem to fix: As soon as the user starts typing a character in the searchbar, the bar disappears (but its still active). </p>
  
  <p>I'm not allowed to post images yet, so here is a link <a href="http://s22.postimg.org/gj7c5wgn5/bug.png" rel="nofollow">to one hosted on postimage</a> which hopefully explains my problem more clearly. From my understanding the search results are displayed in a separate tableview, and the searchbar becomes hidden behind the Navigationbar. I tried hiding the navigation bar but that didn't help. </p>
  
  <p>Some code involving my SearchDisplayController:</p>
  
  <pre><code>func searchDisplayController(controller: UISearchDisplayController!, shouldReloadTableForSearchString searchString: String!) -&gt; Bool {
      self.filterContentForSearchText(searchString)
      return true
  }
  
  func filterContentForSearchText(searchText: String) {
       self.filDealer = self.dealers.filter({( deal: Dealer) -&gt; Bool in
                  let stringMatch = deal.name.lowercaseString.rangeOfString(searchText.lowercaseString)
                  return (stringMatch != nil)
  }
  </code></pre>