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
}
