This is a known problem with hiding nested stack views.
There are essentially 3 solutions to this problem:
- Change the spacing to 0, but then you’ll need to remember the previous spacing value.
- Call
innerStackView.removeFromSuperview(), but then you’ll need to remember where to insert the stack view. - Wrap the stack view in a UIView with at least one 999 constraint. E.g. top@1000, leading@1000, trailing@1000, bottom@999.
The 3rd option is the best in my opinion. For more information about this problem, why it happens, the different solutions, and how to implement solution 3, see my answer to a similar question.