title: Images in view controller changing height for unknown reason
body: <p>My images in interface builder keep going back to a larger height than I want them to, after I change the height to make it the same as the width, which makes them appear to be not as close to the bottom of the view as they should be with my "bottom space to bottom layout" constraint of 15. Here is a screenshot of what I'm talking about.</p>
  
  <p><a href="https://i.stack.imgur.com/4LZGv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/4LZGv.png" alt="Screenshot"></a></p>
  
  <p>I have no constraints to do with height. Only equal widths. But I change the height to make it the same as the width and it straight away goes taller again. How do I stop the images going taller?</p>