swift

//        self.view.backgroundColor = UIColor.greenColor();

        

        var backItem:UIBarButtonItem = UIBarButtonItem(title: "返回", style: UIBarButtonItemStyle.Plain, target: self, action: Selector("backButtonTouched"))

        self.navigationItem.leftBarButtonItem = backItem

        

        var label: UILabel = UILabel()

        let coo=UIColor(red: 0.2, green: 0.1, blue: 1, alpha: 1);

        label.backgroundColor=coo;

        label.frame = CGRect(x:50, y:100, width:200, height:100)

        label.text = "第一次进入swift的世界"

        self.view.addSubview(label)

        

        var button = UIButton.buttonWithType(UIButtonType.System) as? UIButton

        button!.frame = CGRectMake(110.0, 120.0, 100.0, 50.0)

        button!.backgroundColor = UIColor.grayColor()

        button?.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)

        button!.setTitleColor(UIColor.whiteColor(), forState: UIControlState.Highlighted)

        button?.setTitle("Touch Me", forState: UIControlState.Normal)

        button?.setTitle("Touch", forState: UIControlState.Highlighted)

        button?.addTarget(self, action: "buttonAction:", forControlEvents: UIControlEvents.TouchUpInside)

        button!.tag = 100

        self.view.addSubview(button!)

 func backButtonTouched()

    {

        println("点击了返回键")

    }

    func buttonAction(sender: UIButton)

    {

        NSLog("asdfasd")

//        var bbb=maem()

//        self.navigationController?.pushViewController(bbb, animated: true)

//        print(sender);

    }

 self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];

    self.viewContr = [[ViewController alloc] init];

    self.viewContr.view.backgroundColor = [UIColor whiteColor];

    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:self.viewContr];

    nav.navigationBarHidden = YES;

    self.window.rootViewController = nav;

    [self.window makeKeyAndVisible];