Views are Horizontally and Vertically Ambiguous with complex layout

Question

I have a UIViewController on my storyboard that has 2 subviews side-to-side horizontally. I added constraints to fix the leading and trailing edges to a constant (

Answer 1

The problem is that many different widths of the two views will satisfy the constraints that you've set up. Here are two examples (I drew the shapes stacked vertically to make it easier to see the overlap example):

You can add a horizontal space constraint with a value of 0.