SWIFT Button的基本用法

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {

var window: UIWindow?

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
self.window = UIWindow(frame: UIScreen.mainScreen().bounds)
// Override point for customization after application launch.
self.window!.backgroundColor = UIColor.whiteColor()
self.window!.rootViewController = RootViewController()
self.window!.makeKeyAndVisible()
return true
}

}

import UIKit

class RootViewController: UIViewController {

override func viewDidLoad() {
super.viewDidLoad()
//初始化button
let btn = UIButton(type: UIButtonType.Custom)
//尺寸
btn.frame = CGRect(x: 100, y: 100, width: 100, height: 50)
//背景颜色
btn.backgroundColor = UIColor.redColor()
//设置标题
btn.setTitle("按钮", forState: UIControlState.Normal)
//设置标题的颜色
btn.setTitleColor(UIColor.greenColor(), forState: UIControlState.Normal)
//添加点击事件
btn.addTarget(self, action: "printSomeThing:", forControlEvents: UIControlEvents.TouchUpInside)
//self.view加载子视图btn
self.view.addSubview(btn)
}
//点击按钮执行的方法
func printSomeThing(button:UIButton){
print(button)
}

}