swift学习笔记-1

现在开始学习swift！
本篇知识点：1.创建window，设置window的跟控制器，2.创建按钮Btn，添加Btn点击事件，push到下一个控制器。

纯代码创建window的跟控制器，在AppDelegate的didFinishLaunchingWithOptions方法中创建window，并设置window的跟控制为用UINavigationController包裹的ViewController控制器。

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {        // Override point for customization after application launch.        self.window = UIWindow(frame: UIScreen.mainScreen().bounds)        let vc = ViewController()        let nav = UINavigationController(rootViewController: vc)        self.window?.rootViewController = nav;        self.window?.makeKeyAndVisible()        return true    }

在ViewController控制器中创建按钮并添加按钮的点击事件，点击按钮时push到下一个控制器。

override func viewDidLoad() {        super.viewDidLoad()        // Do any additional setup after loading the view, typically from a nib.        self.title = "首页"        self.view.backgroundColor = UIColor.whiteColor()        let btn = UIButton(frame: CGRectMake(10,100,100,44))        btn.setTitle("按钮", forState: .Normal)        btn.backgroundColor = UIColor.orangeColor()        btn.addTarget(self, action: "btnClick:", forControlEvents: .TouchUpInside)        self.view.addSubview(btn)    }    func btnClick(btn:UIButton){        print("btn被点击\(btn.tag)")         let next = NextViewController()        self.navigationController?.pushViewController(next, animated: true)    }