creatingFixedGroup()
Places the item in a fixed group that a person can’t move or remove from the navigation bar during layout customization.
Declaration
func creatingFixedGroup() -> UIBarButtonItemGroupReturn Value
A UIBarButtonItemGroup that contains only this bar button item.
Discussion
A bar button item can only belong to one UIBarButtonItemGroup. If you add a bar button item to a new group, the system removes it from its previous group.