保持宽高比和不同设备的自动布局

Question

I have labels and toolbars on the top and bottom of the screen with height constraints. And I got UIImage between toolbars. So toolbars and labels are keeping same height for different devices while space between toolbars is changeable.

My goal is to keep aspect ratio 1:1 for devices from SE to IPad and to center UIImage between toolbars by stretching it until it reach superview margins on sides or toolbars on top and bottom. I was tried different approaches but the best thing I could get is on below screenshot.

It's keeping aspect ratio but I can't figure out how to keep it centered between toolbars.

Constraints for UIImage:

Since I'm working on iOS 8 supported app I didn't use UIStackView and try to find a solution with constraints only.

Answer 1

You need to do following things :

1. Add a new view (says, centerView) in between the yellow and green view and give it clear color and give below constraints

   • Leading, trailing to superview as constant = 0.
   • Top to yellow view as constant = 0
   • Bottom to yellow view as constant = 0

2. Now in centerView add ImageView which have Apple logo and give below constraints.

   • Give it fixed height as you want.
   • give it vertically and horizontally centered wrt its superView.