Swift_UI_UIButton

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        // 1. 自定义UIbutton类型为Custom
        var btn : UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton

        // 2. 设置UIButton的尺寸
        btn.frame = CGRectMake(, , , );

        // 3. 设置普通状态下的button的字
        btn.setTitle("swiftButton", forState: UIControlState.Normal)

        // 4. 设置普通状态下的buton字的颜色
        btn.setTitleColor(UIColor.redColor(), forState: UIControlState.Normal)

        // 5. 设置高亮状态下的button的字的
        btn.setTitle("HightLight", forState: UIControlState.Highlighted)

        // 6. 设置高亮状态下的button的字的颜色
        btn.setTitleColor(UIColor.blueColor(), forState: UIControlState.Highlighted)

        // 7. 加载图片  ! 为可选类型,说明返回的图片一定是存在的不存在将崩溃
        var btnImageN: UIImage = UIImage(named: "")!
        var btnImageHL: UIImage = UIImage(named: "")!

        // 8. 设置button的图片
        //btn.setImage(btnImageN, forState: UIControlState.Normal)

        // 9. 设置button的图片
        //btn.setImage(btnImageHL, forState: UIControlState.Normal)

        // 10. 设置普通状态下button的背景图片
        btn.setBackgroundImage(btnImageN, forState: UIControlState.Normal)

        // 11. 设置高亮状态下button的背景图片
        btn.setBackgroundImage(btnImageHL, forState: UIControlState.Highlighted)

        // 12. 设置UIButton的触发事件
        btn.addTarget(self, action: "btnClick:", forControlEvents: UIControlEvents.TouchUpInside)

        self.view.addSubview(btn)

    }

    func btnClick(btn:UIButton!)
    {
        println("btnClick")
    }
}