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。