Swift version: 5.1
You can't do this –
UIStackView is a non-drawing view, meaning that
drawRect() is never called and its background color is ignored. If you desperately want a background color, consider placing the stack view inside another
UIView and giving that view a background color.
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Available from iOS 9.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.