The view alignment within the stack view.
The default value for this property depends on whether the stack view is horizontal or vertical:
These constants are described as part of the
NSLayoutAttribute enumeration in
NSLayoutConstraint; see that enumeration for the other possible alignment values.
Configuring the Stack View Layout
The horizontal or vertical layout direction of the stack view.
The minimum spacing, in points, between adjacent views in the stack view.
The geometric padding inside the stack view, surrounding its views, in points.
A Boolean value that indicates whether the spacing between adjacent views should equal each other.