title: iOS 7 TableView in a ViewController and NavigationBar blurred effect
body: <p>I started building a TableView in my app by using a TableViewController in a storyboard. When you do this, you have a very cool effect when you scroll down your list : the cells moving behind the nav bar get blurred.</p>
  
  <p>Some time later, I had to move from this TableViewController to a ViewController with a TableView inside (I had to add other views at the bottom of the table).</p>
  
  <p>In order to avoid having the first cells hidden by the navigation bar (being over it), I added constraints to the Top and Bottom Layout Guides, and to the left and right edges of the view.</p>
  
  <p>This works fine, but I lost the cool blurred scrolling effect : the cells seem to be disappearing before going behind the navigation bar.</p>
  
  <p>I've seen workarounds with people not using constraints and putting magic numbers in interface builder. I cannot do this, first because I dislike it, and second because I have to be iOS 6 compatible.</p>
  
  <p>What did I miss to be able to benefit again from the blurred navigation bar effect ?</p>