viewDidUnhide()
Invoked when the view is unhidden, either directly, or in response to an ancestor being unhidden
Declaration
func viewDidUnhide()Discussion
The view receives this message when its isHiddenOrHasHiddenAncestor state goes from true to false. This can happen when the view or an ancestor is marked as not hidden, or when the view or an ancestor is removed from its containing view hierarchy.