ios firebase用户等于零

Question

我试图使用firebase在ios上创建一个简单的身份验证屏幕。我是通过在youtube上观看教程来实现的。我正在关注所有事情，但当我按下按钮登录我的用户时，var的值变为等于nil。因此，它无法进入下一个视图。有人知道如何解决这个问题吗？

    @IBAction func signInButtonTapped(_ sender: UIButton) {
    // TODO: Do some form validation on email and password

    if let email = emailTextField.text, let pass = passwordTextField.text {

        // Check if it's sign in or register
        if isSignIn {
            // Sign in the user with Firebase
            Auth.auth().signIn(withEmail: email, password: pass, completion: { (user, error) in
                // Check that user isn't' nil
                if let u = user {
                    // user is found, go to homescreen
                    self.performSegue(withIdentifier: "goToHome", sender: self)
                }
                else {
                    // Error: check error and show message
                }
            })

        } else {
            // Register the user with Firebase
            Auth.auth().createUser(withEmail: email, password: pass, completion: { (user, error) in

                // Check that user isn't nil
                if let u = user {
                    // User is found, go to homescreen
                    print("\(email) \(pass)")
                    self.performSegue(withIdentifier: "goToHome", sender: self)
                } else {
                    // Error: check error and show message
                    print(error)
                }
            })
        }
    }

}

Answer 1

我试过你的问题它工作正常，再次检查这个答案@bag

import UIKit
import Firebase
import FirebaseAuth
class ViewController: UIViewController {

@IBOutlet weak var emailTextField: UITextField!

@IBOutlet weak var passwordTextField: UITextField!


@IBOutlet weak var signInButton: UIButton!



var isSignIn:Bool = true
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from a nib.
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
@IBAction func segmentcontroltapped(_ sender: UISegmentedControl) {
 isSignIn = !isSignIn
    if isSignIn {
        signInButton.setTitle("signin", for: .normal)
    }else{
   signInButton.setTitle("Register", for: .normal)
    }
}

@IBAction func sigInButtonTapped(_ sender: UIButton) {


    if let email = emailTextField.text, let pass = passwordTextField.text {

        // Check if it's sign in or register
        if isSignIn {
            // Sign in the user with Firebase
            Auth.auth().signIn(withEmail: email, password: pass, completion: { (user, error) in
                // Check that user isn't' nil
                if let u = user {
       print("\(email) \(pass)")
                }
                else {
                print(error)
                }
            })

        } else {
            // Register the user with Firebase
            Auth.auth().createUser(withEmail: email, password: pass, completion: { (user, error) in

                // Check that user isn't nil
                if let u = user {
                    // User is found, go to homescreen
                    print("\(email) \(pass)")
                 //   self.performSegue(withIdentifier: "goToHome", sender: self)
                } else {
                    // Error: check error and show message
                    print(error)
                }
            })
        }
    }
}

}