在另一个类中时，Swift Firebase身份验证不起作用 [英] Swift Firebase authentication not working when in another class

问题描述

我正在尝试一个仅出于娱乐目的的项目，我想使用Firebase.我为用户创建了一个类，用于与用户相关的事情.我正在测试注册功能，当它在一个类中时，它首先产生false，然后产生true.但是，当我不将其放置在单独的类中并直接将其放置在视图控制器中时，它会产生true并按照指示执行segue.由于我不知道如何最好地解释这一点，因此我将在下面显示哪些代码有效，哪些无效.

I am attempting a project just for fun, I would like to use Firebase. I made a class to user for user related things. I was testing the signing up function and when it is within a class it first yields false then yields true. But when I do not place this in a separate class and place it directly in the view controller it yields true and performs the segue as indicated. Due to I not knowing how to explain this best I will show below which code works and which does not.

Firebase嵌入在一个类中:

Firebase embedded in a class:

    import Foundation
import Firebase
class Account  {

    var email: String
    var password: String
 init(email: String, password: String) {
        self.email = email
        self.password = password

    }
   func createAccount ()-> Bool{
        var made = false
        Auth.auth().createUser(withEmail: email, password: password) { (user, error) in
            if (error == nil) {
                print("Registration Successful")
                made = true

            }else{

                print(error!)
                made = false
            }
        }
        print("this is\(made)")
     return made

    }

按钮代码:

@IBAction func signUpButton(_ sender: UIButton) {
signUpEmail = emailTextField.text!
signUpPassword = passwordTextField.text!
let signUp = Account(email: signUpEmail, password: signUpPassword);
let signUpOccur = signUp.createAccount()
if( signUpOccur == true){
    performSegue(withIdentifier: "signUpToHome", sender: self)
}else{
  print(signUpOccur)
}}

////this产生:"this is false"，然后"Registration Success"，然后"this is true"，但是由于首先产生false，所以我不执行Segue

////this yields: "this is false" then "Registration Successful" then "this is true" but does not perform the Segue due to first yielding false I assume

可以正常工作的代码:

 signUpEmail = emailTextField.text!
        signUpPassword = passwordTextField.text!
        Auth.auth().createUser(withEmail: signUpEmail, password: signUpPassword) { (user, error) in
            if (error == nil) {
                print("Registration Successful")
                self.performSegue(withIdentifier: "signUpTohome", sender: self)
      }else{

                print(error!)
             }
        }

是否可以将事物放置在类和函数中，还是最好以其工作方式将其放置在按钮中?还是我做错了什么?

Is it possible to place thing within a class and function or would it be best to just place it within the button the way it works? Or is there something I am doing wrong?

感谢您的所有反馈

推荐答案

您的问题是createUser方法是异步的.您要在createUser完成之前从函数中返回made.

Your issue is that the createUser method is asynchronous. You are returning made from your function before createUser finishes.

func createAccount()-> Bool {...}

应该是

func createAccount(completion: (Bool)->Void) {...}

然后，当对createUser的Firebase Auth调用完成时，您调用completion(made).

And then when the Firebase Auth call to createUser completes, you call completion(made).

您将需要快速阅读编程和闭包中的异步调用，以更好地理解.您可以从本文 a>.

You will need to read up on asynchronous calls in programming and closures in swift to understand better. You can start with something like this article.

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