Swift UI – 告警框（UIAlertView）

注：代码已升级至Swift4

创建告警框

创建并弹出一个告警框，并带有“确定”和“取消”两个按钮

注：自iOS 8起，建议使用UIAlertController。点击查看UIAlertController的用法

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let alertView = UIAlertView()
        alertView.title = "系统提示"
        alertView.message = "您确定要离开appblog.cn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) {
            print("点击了取消")
        } else {
            print("点击了确认")
        }
    }
}

告警框样式

告警框有下面4种样式

Default：默认样式
PlainTextInput：带输入框的告警框
SecureTextInput：带密码框的告警框
LoginAndPasswordInput：带输入框和密码框的告警框

下面是一个使用输入框和密码框的告警框样例：

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) {
            print("点击了取消")
        } else {
            let name = alertView.textFieldAtIndex(0)
            let password = alertView.textFieldAtIndex(1)
            print("用户名是：\(name!.text) 密码是：\(password!.text)")
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}