Making a UIButton a % of the screen size

Question

I noticed certain button sizes look great on one the iPhone 5 simulator but do not look as good on the iPhone 6 simulator and this is because the heights or constraints that

Answer 1

This function gives you the bounds of the screen

var bounds = UIScreen.mainScreen().bounds

And then you can set the button width multipliying 0.4 x bounds.size.width

Regards