title: Autolayout heights proportionally but with upper limit constraint
body: <p><img src="https://i.stack.imgur.com/7I2Ck.jpg" alt="UI Sheet for design"></p>
  
  <p>I am trying to use Autolayout and only Interface Builder to produce the following scene with 2 views in all four iPhone devices. As the picture indicates I would like that view2 (the bottom view) be no smaller than 45points on a iPhone 4 and never get higher than 65 points. View2 does not have to be exactly the indicated number of points in the attached image if for example your idea for a solution uses some kind of proportions.</p>