I need to center a UIButton('Call') between a UIView(the dialpad) and the bottom layout guide. The view is always align center x and align center y. 

So, I'd like to have the vertical constraints between the view and the call button and the call button and the bottom layout guide always equal

The UIView ('DialPad') constraints
[![enter image description here](https://i.stack.imgur.com/YZO2S.jpg)](https://i.stack.imgur.com/YZO2S.jpg) 

The UIButton ('Call') is currently constained to the bottom layout guide. I want it to be spaced evenly between the UIView and the bottom layout guide

[![enter image description here](https://i.stack.imgur.com/HYXGy.jpg)](https://i.stack.imgur.com/HYXGy.jpg)

and the storyboard preview shows different sizes and how the Call button IS NOT centered between the UIView and the bottom layout guide. Extremely obvious in the 4.7" layout

[![enter image description here](https://i.stack.imgur.com/AEhMj.jpg)](https://i.stack.imgur.com/AEhMj.jpg)