title: search display controller issue on ios7
body: <p>It's only happened on iPad,not in iPhone.</p>
  
  <p>I have a search display controller in my listview, under a titlebar(not navigation bar). 
  It can be displayed correctly, even I don't set self.edgesForExtendedLayout=UIRectEdgeNone.</p>
  
  <p>The issue is:
  When I click in the text field of the searchbar, and then click someplace else to hide the keyboard and end the text input, the searchbar will be shown at the top-left corner of the screen. 
  p.s.My listview is in the middle of the screen.</p>
  
  <p>In one of my modal view, the search bar is under a navigation bar, there is no such issue. But I must set <code>self.edgesForExtendedLayout=UIRectEdgeNone</code> to show the search bar.</p>
  
  <p>Could you give me a hand please?</p>
  
  <p>Thanks a lot.</p>