Add UIView with 3 UIButtons in a UIStackView

I would like to add a UIView which has 3 UIButtons in a UIStackView. The reason is that I would like to make this UIView transparent to the screen by altering its alpha. As far as I experienced, I see that I can add only one UIView which has just one subView (e.g. UIButton, UILabel etc) in a StackView avoiding problems of layout. I really appreciate if someone can provide any feedback.


Regards,