# Defines the orientation of the arranged views in `UIStackView`
extern class UILayoutConstraintAxis in "ObjC" `{ NSInteger `}
new horizontal in "ObjC" `{ return UILayoutConstraintAxisHorizontal; `}
new vertical in "ObjC" `{ return UILayoutConstraintAxisVertical; `}
end
lib/ios/ui/uikit.nit:556,1--560,3