The delegate object for the stack view.
The system calls a delegate method when resizing has caused a view to be detached from or reattached to the stack view. For more information, see
Responding to Stack-Related Changes
To configure a custom class to respond to a view detaching from, or reattaching to, a stack view (an instance of the
NSStackView class), configure the custom class to adopt the
NSStackViewDelegate protocol. Then, in a stack view instance, set the
delegate property to refer to an instance of your custom class.