title: iOS Autolayout - Position view correctly below translucent navigation bar
body: <p>In my storyboard, I have a <code>UIImageView</code> that I'd like to place at a fixed distance below a translucent navigation bar. I have the simulated top bar for the view controller set to the translucent bar, and the constraint I have now says "Top Space to Superview Equals 52," 8 points below the bar. </p>
  
  <p>However, when the view rotates to landscape, the navigation bar shrinks to 34 points, and the image view is still at 52 points like it was in portrait. </p>
  
  <p>What constraint can I use in IB to place the image view at 8 points below the navigation bar no matter how tall the bar is?</p>
  
  <p>Thanks!</p>