通过UIAlertController登录/注册

Question

我试图创建一个登录/注册通过警报弹出一旦登录或注册按钮被点击。我正在尝试将它实现到Firebase 4中。到目前为止，我已经完成了这一任务，但是我还在研究如何实现Firebase。我读过他们的文档，但我似乎无法让alertView正常工作。有什么建议吗？

import UIKit
import Firebase

class welcomeController: UIViewController {

    alertController.addTextFieldWithConfigurationHandler { textField in
        textField.placeholder = "Email"
        textField.keyboardType = .EmailAddress
    }

    alertController.addTextFieldWithConfigurationHandler { textField in
        textField.placeholder = "Password"
        textField.secureTextEntry = true
    }

    alertController.addTextFieldWithConfigurationHandler { textField in
        textField.placeholder = "Password Confirmation"
        textField.secureTextEntry = true
    }
    alertController.addAction(loginAction)
    alertController.addAction(forgotPasswordAction)
    alertController.addAction(cancelAction)
}

Answer 1

请参考以下代码。为了演示登录和注册，我增加了登录和注册的操作。为了更好地理解，我已经在登录和注册操作中提到了重复的代码。这段代码只是为了你的理解。

let alertController = UIAlertController(title: nil, message: "Login/Signup", preferredStyle: .alert)

    alertController.addTextField { (textField) in
        textField.placeholder = "Email"
        textField.keyboardType = .emailAddress
    }

    alertController.addTextField { (textField) in
        textField.placeholder = "Password"
        textField.isSecureTextEntry = true
    }

    alertController.addTextField { (textField) in
        textField.placeholder = "Password Confirmation"
        textField.isSecureTextEntry = true
    }

    let loginAction = UIAlertAction(title: "Login", style: .default) { (_) in
        let emailField = alertController.textFields![0]
        let passwordField = alertController.textFields![1]
        let conformPasswordField = alertController.textFields![2]

        //Perform validation or whatever you do want with the text of textfield

        //Login With Firebase
        Auth.auth().signIn(withEmail: emailField.text!, password: passwordField.text!) { (user, error) in
            // ...
        }

    }

    let signupAction = UIAlertAction(title: "Signup", style: .default) { (_) in
        let emailField = alertController.textFields![0]
        let passwordField = alertController.textFields![1]
        let conformPasswordField = alertController.textFields![2]

        //Perform validation or whatever you do want with the text of textfield

        //SigunUp With Firebase
        Auth.auth().createUser(withEmail: emailField.text!, password: passwordField.text!) { (user, error) in
            // ...
        }
    }

    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
    alertController.addAction(loginAction)
    alertController.addAction(signupAction)
    alertController.addAction(cancelAction)

    DispatchQueue.main.async {
        self.present(alertController, animated: true, completion: nil)
    }

要了解有关firebase身份验证和登录/注册过程的更多信息，请参考以下链接：https://firebase.google.com/docs/auth/ios/password-auth

Answer 2

处理操作处理程序中的事件，例如：

let loginAction = UIAlertAction(title: "SIGN UP", style: .default) { (action) in

    guard let textFields = alertController.textFields else { return } //show error

    let email       = textFields[0].text
    let password    = textFields[1].text
    let cPassword   = textFields[2].text

    print(email, password, cPassword)

}