I would like to have two UIButtons side by side in a UIStackView both at 50% of the view. When I drag two buttons into the Stack View, the first one takes up the majority of the view and the other is the smallest width it can be. 
Should I be doing something else?
Thanks 
UIStackView Layout
859 views Asked by Tom Coomer At
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You are doing right, but you may missed to do below thing.
You need to set the
UIStackViewDistribution&UIStackViewAlignmentproperty as per your need.The
distributionproperty determines the layout of the arranged views along the stack’s axis.The
alignmentproperty determines the layout of the arranged views perpendicular to the stack’s axis.Refer this for more info.