title: Cannot get view to use entire screen width on iPhone 6+
body: <p>In my storyboard I have a MapView that I would like to use the entire width of the screen.  I created two constraints for the leading and the trailing space and they are set up as follows:</p>
  
  <p><img src="https://i.stack.imgur.com/1YaEk.png" alt="Constraints configuration"></p>
  
  <p>On the iPhone 4S - 6 the view works as expected, with the map using the entire screen width.  But on the 6+ I can see that the map isn't using the entire width and has about 5px of padding on both sides, as seen here - it's hard to see with the background being white:</p>
  
  <p><img src="https://i.stack.imgur.com/eltWY.png" alt="enter image description here"></p>
  
  <p>How can I make this mapview use the entire width of the screen for the 6+?</p>