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tab bar buttons connection with tab bar controller controller defining as IBOutlet delegate viewControllers property created automatically customizing delegate difference from navigation controller initWithTabBarSystemItem:tag:method interface building item badgeValue property linking to view controller tabBarController:didEndCustomizingViewControllers:changed: tabBarController:didSelectViewController: tabs, adding view controller anatomy creating creating objects as subviews views, connecting vs. toolbar Tab Bar Application, 2nd tab bar controller tabBarController tabBarController:didEndCustomizingViewControllers:changed: tabBarController:didSelectViewController: tabBarItem, 2nd table cells ...