Centering a group of objects in between other objects in Xcode

I am trying to center a group of buttons and labels between a navigation bar and UI View. I have tried creating a constraint to make the space from the button to the UI view more than 8. I have not been able to get it to work when trying this. How do I get the group of buttons to center? Below are some screenshots of what is happening and what I set. I have only used the storyboard interface to create the items and set the constraints. I would prefer a solution using the storyboard.

#swift #xcode