detect when a tabBar item is pressed via UITabBarController from App Delegate
问题 I know this question has been asked a few times, but I am still stuck on the case when I have my UITabBarController in my AppDelegate class and viewControllers are set there only as self.tabBarController.viewControllers = @[aboutUsNavController,myProfileNavController, projectsListNavController, feedsNavController,homeViewController]; Now what I want is to perform a task at the tap of TabBar item feedsNavController not in viewWillAppear (because it is pushing a detailView via