How can I find out when a NSTabViewItem has been changed, i.e. a user has changed the view of an NSTabView?
Ideally I want to generate a notification but any solution would be welcome.
My original answer suggested to observe selectedTabViewItem of NSTabView, but that doesn't seem to work (on testing I can only get it to observe NSKeyValueObservingOptionInitial).
A probably smarter solution is to use a delegate. Implement tabView:didSelectTabViewItem: in the relevant controller.
Docs here.