Swift - 告警框（UIAlertView）的用法

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class ViewController: UIViewController{

    override func viewDidLoad() {

        super.viewDidLoad()

        var alertView = UIAlertView()

        alertView.title = "系统提示"

        alertView.message = "您确定要离开hangge.com吗？"

        alertView.addButtonWithTitle("取消")

        alertView.addButtonWithTitle("确定")

        alertView.cancelButtonIndex=0

        alertView.delegate=self;

        alertView.show()

    }

    func alertView(alertView:UIAlertView, clickedButtonAtIndex buttonIndex: Int){

        if(buttonIndex==alertView.cancelButtonIndex){

            println("点击了取消")

        }

        else

        {

            println("点击了确认")

        }

    }

}

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import UIKit

class ViewController: UIViewController {

    var alertView = UIAlertView()

    override func viewDidLoad() {

        super.viewDidLoad()

        alertView.title = "系统登录"

        alertView.message = "请输入用户名和密码！"

        alertView.addButtonWithTitle("取消")

        alertView.addButtonWithTitle("确定")

        alertView.cancelButtonIndex=0

        alertView.delegate=self;

        alertView.alertViewStyle = UIAlertViewStyle.LoginAndPasswordInput

        alertView.show()

    }

    func alertView(alertView:UIAlertView, clickedButtonAtIndex buttonIndex: Int){

        if(buttonIndex==alertView.cancelButtonIndex){

            println("点击了取消")

        }

        else

        {

            let name = alertView.textFieldAtIndex(0)

            let password = alertView.textFieldAtIndex(1)

            println("用户名是：\(name!.text) 密码是：\(password!.text)")

        }

    }

    override func didReceiveMemoryWarning() {

        super.didReceiveMemoryWarning()

    }

}