AppDelegate中
let VC = ViewController()
self.window?.rootViewController = VC
ViewController
let one = oneViewController()
let oneNav = UINavigationController.init(rootViewController: one)
oneNav.tabBarItem = UITabBarItem.init(title: "消息", image: UIImage.init(named: "tabbar_me"), selectedImage: UIImage.init(named: "tabbar_meHL"))
oneNav.tabBarItem.badgeValue = "99+"
let two = twoViewController()
let twoNav = UINavigationController.init(rootViewController: two)
twoNav.tabBarItem = UITabBarItem.init(title: "联系人", image: UIImage.init(named: "tabbar_me"), selectedImage: UIImage.init(named: "tabbar_meHL"))
let three = threeViewController()
let threeNav = UINavigationController.init(rootViewController: three)
threeNav.tabBarItem = UITabBarItem.init(title: "动态", image: UIImage.init(named: "tabbar_me"), selectedImage: UIImage.init(named: "tabbar_meHL"))
self.viewControllers = [oneNav,twoNav,threeNav]