swift 创建第一个UIAlertView 和UIActionSheet

//创建 UIActionSheet

／／一定要指明类型。不编译不通过

func ActionSheet(sender:UITapGestureRecognizer)
    {
        let actionSheet: UIActionSheet = UIActionSheet(title:"Are you sure?", delegate:self, cancelButtonTitle:"Cancel", destructiveButtonTitle:"Yes,I'm sure!");
        actionSheet.showInView(self.view)
        
    }

//actionSheet delegate
    func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int) {
        if buttonIndex == 0{
            println("点击位置为\(buttonIndex)")
        }
    }

//创建UIAlertView

func firstSwift(sender:UIButton)
    {
       println("第一个button的点击事件")
       self.label1.text = "button点击了"
       var alert = UIAlertView(title: "⚠", message: "button被点击了", delegate: self, cancelButtonTitle: "知道了")
       alert.show()
    }