1 创建三个视图控制器：FirstViewController、SecondViewController和ThirdViewController 2、修改FirstViewController.swift的viewDidLoad override func viewDidLoad() { super.viewDidLoad()
self.view.backgroundColor = UIColor.brown self.navigationItem.rightBarButtonItem = UIBarButtonItem(title：”下一页”, style： UIBarButtonItemStyle.Plain, target：self, action：
selector(FirstViewController.nextPage))
} 3、 SecondViewController.swift的viewDidLoad override func viewDidLoad() { super.viewDidLoad() self.view.backgroundColor = UIColor.purple } 4、修改AppDelegate.swift的didFinishLaunchingWithOptions func application(application：UIApplication, didFinishLaunchingWithOptions launchOptions：[NSObject： AnyObject]？) -> Bool { let firstViewController = FirstViewController() let thirdViewController = ThirdViewController() let tabBarController = UITabBarController() let navigationController =UINavigationController(rootViewController：firstViewController) tabBarController.viewControllers =[navigationController, thirdViewController] let tabBar = tabBarController.tabBar let item = tabBar.items！[0] item.image = UIImage(named：“Tab1”) item.title = “item1” let item3 = tabBar.items！[1] item3.image = UIImage(named：“Tab3”) item3.title = “item3” window？.rootViewController = tabBarController return true }
