iOS：使用固定的长宽比将视图约束到后缘或下边缘

Question

I have an ImageView that is constraint to be a square and on its top edge:

http://i.imgur.com/dACmwPN.png

The problem is that I want the view to fill the entire bottom space without exceeding the superview. In other words it should conform to either the width or the remaining height depending on which one is smaller.

The guide I am following suggests to add all of these to a stack view, but that is an iOS 9 feature and I want to develop for iOS8. What would be a good solution for that SDK?

Answer 1

I would add width = height constraint to keep the aspect ratio, then bottom and trailing constraints with lower priority (900) and >= margin value (ex 8) . This way image will be a square and it will not go over bottom or right. Also aspect fit should be set.