大家看到题目应该就知道我要说的东西了，今天要给大家介绍button控件，也是比较常用的用法。我就不啰嗦什么了。直接上代码：

var myButton: UIButton!

//Attention: buttonWithType return the type of AnyObject

        myButton = UIButton.buttonWithType(.System) as? UIButton(这里有必要说明一下，buttonWithType最终返回的是一个AnyObject，所以这里要用到类型转换)

        //Set the location and size of button

        myButton.frame = CGRectMake(110, 70, 200, 100)

        //Add a name to button,and set state

        myButton.setTitle("Press Me", forState: .Normal)

        myButton.setTitle("I`m Pressed", forState: .Highlighted)

        //Add action to button

        myButton.addTarget(self, action: "buttonIspressed:", forControlEvents: .TouchDown)

        myButton.addTarget(self, action: "buttonIsTaped:", forControlEvents: .TouchUpInside)

        //Add backgroundColor

        myButton.backgroundColor = UIColor.greenColor()

        //Add image to backgound of myButton

        var image = UIImage(named: "pg.jpg")

        myButton.setBackgroundImage(image, forState: .Normal)

        view.addSubview(myButton)

到这里button的用法差不多就讲完了。下面我要说的是AlertView，不是AlertViewController。大家看仔细：

myAlertView = UIAlertView(title: "Done", message: "The button is tapped", delegate: self, cancelButtonTitle: "Cancell", otherButtonTitles: "ok")

        myAlertView!.show()

Ok，今天就说这么多了。明天一个下载图片的demo，最近做项目要用。