Swift - UIAlertController

概述添加AlertController import UIKitvar imageView:UIImageView!class ViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() let button = UIButton(frame: CG 添加AlertController

import UIKitvar imageVIEw:UIImageVIEw!class VIEwController: UIVIEwController {    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        let button = UIbutton(frame: CGRect(x: 150,y: 250,wIDth: 50,height: 50))        button.backgroundcolor = UIcolor.black        button.addTarget(self,action: #selector(VIEwController.alertVIEw),for: .touchUpInsIDe)        self.vIEw.addSubvIEw(button)    }    @objc func alertVIEw()    {        //创建UIAlertController(警告窗口)        let alert = UIAlertController(Title: "information",message: "sub Title",preferredStyle: .alert)        //创建UIAlertController(动作表单)        let alertB = UIAlertController(Title: "information",preferredStyle: .actionSheet)        //创建UIAlertController的Action        let OK = UIAlertAction(Title: "OK",style: .default) { (UIAlertAction) in            print("you selected ok")        }        let Cancel = UIAlertAction(Title: "Cancel",style: .cancel) { (UIAlertAction) in            print("you selected cancel")        }        //将Actiont加入到AlertController        alert.addAction(OK)        alert.addAction(Cancel)        //以模态方式d出        self.present(alert,animated: true,completion: nil)    }}

添加文本输入框

import UIKitvar imageVIEw:UIImageVIEw!class VIEwController: UIVIEwController {    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        self.presentedVIEwController?.dismiss(animated: false,completion: nil)    }    overrIDe func vIEwDIDAppear(_ animated: Bool) {        super.vIEwDIDAppear(animated)        //添加任意数量文本输入框        let alertController = UIAlertController(Title: "登陆",message: "输入账号密码",preferredStyle: .alert)        alertController.addTextFIEld { (textFIEld:UITextFIEld) in            textFIEld.placeholder = "用户"}        alertController.addTextFIEld { (textFIEld:UITextFIEld) in            textFIEld.placeholder = "密码"            textFIEld.isSecureTextEntry = true        }        let Login = UIAlertAction(Title: "登陆",style: .default,handler: nil)        let Quit = UIAlertAction(Title: "退出",style: .cancel,handler: nil)        alertController.addAction(Login)        alertController.addAction(Quit)        //模态d出提示框        self.present(alertController,completion: nil)        //移除提示框        self.presentedVIEwController?.dismiss(animated: false,completion: nil)    }}

自动消失的提示框

import UIKitvar imageVIEw:UIImageVIEw!class VIEwController: UIVIEwController {    overrIDe func vIEwDIDLoad() {                }    overrIDe func vIEwDIDAppear(_ animated: Bool) {        super.vIEwDIDAppear(animated)        let alert = UIAlertController(Title: "自动关闭",message: "3s",preferredStyle: .alert)        self.present(alert,completion: nil)        dispatchQueue.main.asyncAfter(deadline: dispatchTime.Now() + 3) {            self.presentedVIEwController?.dismiss(animated: true,completion: nil)    }  }}

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