How to set top of a view to bottom of another view

Question

I would like to set top of a view to bottom of another view. like this:

A and B is a symbol to show what I want to do with views.

I want to A (image view) symbol always below of B (image view) symbol.

B view pinned in center horizontal and top of parent view.

Answer 1

Align the top of the right view to the bottom of the left view:

Answer 2

ctrl+drag from A to b and set a vertical spacing constraint. From that ctrl+drag menu, you can also align the centers/edges so you can have it laid out however you want it.