title: iOS: Resizing UIImageView with AutoLayout
body: <p>I am new to AutoLayout and struggling with it a bit. I have a <code>UIImageView</code> which is part of an UIView. When the app is running on a <strong>3.5 inch</strong> device, I want the UIImageView to resize according to the change of the screen size.</p>
  
  <p>I am not sure how to achieve this. From what I have seen so far, you can only set a fixed width and height of the views, is it possible to make them <strong>dynamically resize</strong> ? In other words, how can the <code>UIImageView</code> resize accordingly to the super view's height ? </p>