如何在不同 class 中使用 UIAlert 获取文本字段值？ Swift

Question

我制作了一个包含不同类型通用 UIAlert 代码的文件，以便我可以重复使用它们。我的问题是如何从另一个 class 获取 textfield value？到目前为止，我找到的所有答案都编码在同一个 class 中，我不希望这样。谢谢。

UIAlert 文件

func alertVerify(title: String, message: String, sender: UIViewController, verifyActionCompletionHandler: ((UIAlertAction) -> Void)? = nil, resendActionCompletionHandler: ((UIAlertAction) -> Void)? = nil) {
    let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
    let verifyAction = UIAlertAction(title: "Verify", style: .default, handler: verifyActionCompletionHandler)
        alert.addAction(verifyAction)
    let resendAction = UIAlertAction(title: "Resend", style: .default, handler: resendActionCompletionHandler)
       alert.addAction(resendAction)
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        alert.addAction(cancelAction)

    alert.addTextField(configurationHandler: { textField in
        textField.placeholder = "Verification code"
    })
    DispatchQueue.main.async(execute: {
        sender.present(alert, animated: true)
    })
}

ViewController

func verifyEmail() {
        guard let email = inputTextField.text else {
            return
        }

        alertVerify(title: "Email Verification Code", message: "Enter the verification code we send in your updated email adress.", sender: self, verifyActionCompletionHandler: { UIAction in
            if let inputCode = alert.textFields?.first?.text { //error: unresolved identifier 'alert'
                print("Verification code: \(inputCode)")
                //Do something
            }
        }, resendActionCompletionHandler: { UIAction in
            self.updateData(updateItem: "email", updateData: ["email": email], endpoint: "info")
        })
    }

Answer 1

您也可以向您的方法添加另一个参数以传递警报控制器：

func alertVerify(title: String, message: String, sender: UIViewController, alert: UIAlertController, verify: ((UIAlertAction) -> Void)? = nil, resend: ((UIAlertAction) -> Void)? = nil) {
    alert.title = title
    alert.message = message
    alert.addTextField { 
        [=10=].placeholder = "Verification code"
    }
    alert.addAction(.init(title: "Verify", style: .default, handler: verify))
    alert.addAction(.init(title: "Resend", style: .default, handler: resend))
    alert.addAction(.init(title: "Cancel", style: .cancel))
    DispatchQueue.main.async {
        sender.present(alert, animated: true)
    }
}

然后当您调用您的方法时，您将警报控制器的实例传递给它：

func verifyEmail() {
    let alert = UIAlertController(title: nil, message: nil, preferredStyle: .alert)
    alertVerify(title: "Email Verification Code", 
                message: "Enter the verification code we send in your updated email adress.",
                sender: self,
                alert: alert,
                verify: { _ in
        let inputCode = alert.textFields![0].text!
        print("Verification code: \(inputCode)")
    }, resend: nil)
}

另一种选择是子类化 UIAlertController 并向其添加您的自定义方法：

AlertController.swift

import UIKit
class AlertController: UIAlertController {
    var controller: UIViewController!
    convenience init(title: String?, message: String?, sender: UIViewController) {
        self.init(title: title, message: message, preferredStyle: .alert)
        controller = sender
    }
    func verify(_ action: ((UIAlertAction) -> Void)? = nil, resend: ((UIAlertAction) -> Void)? = nil) {
        if actions.isEmpty {
            addTextField {
                [=12=].placeholder = "Verification code"
            }
            addAction(.init(title: "Verify", style: .default, handler: action))
            addAction(.init(title: "Resend", style: .default, handler: resend))
            addAction(.init(title: "Cancel", style: .cancel))
        }
        DispatchQueue.main.async {
            self.controller.present(self, animated: true)
        }
    }
}

然后实例化您的自定义警报控制器并从中调用您的方法：

func verifyEmail() {
    let alert = AlertController(title: "Email Verification Code", message: "Enter the verification code we send in your updated email adress.", sender: self)
    alert.verify({ _ in
        let inputCode = alert.textFields![0].text!
        print("Verification code: \(inputCode)")
    }, resend: nil)
}

如何在不同 class 中使用 UIAlert 获取文本字段值？ Swift

How to get textfield value with UIAlert in different class? Swift

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