title: Image in UIButton doesn't scale when using Autolayout.
body: <p>I have a UIButton that I'd like to be as wide as the view and then have the height adjust in a fixed aspect ratio. I've set my constraints for the button to be as wide as the view. And the height to be in a 2:1 aspect ratio like this (<a href="http://imgur.com/1epStSI" rel="nofollow">http://imgur.com/1epStSI</a>)</p>
  
  <p>But when I move it on to iPhone 6 or 6 Plus screen the image itself doesn't scale while the button does. I've added a green background color for empahsis. (<a href="http://imgur.com/NuTONRQ" rel="nofollow">http://imgur.com/NuTONRQ</a>)</p>
  
  <p>The mode is set to Aspect Fill. And for the record I've tried multiple modes. </p>
  
  <p>Any help would be appreciated. </p>