Question

我正在创建一个简单的登录注册应用。但是我收到了一个错误，我不知道如何解决它，请帮忙！这是我的代码：

//
//  ViewController.swift
//  CHLogbook-Application
//
//  Created by Timothy Dillan on 06/01/18.
//  Copyright © 2018 TPINC. All rights reserved.
//

import UIKit
import FirebaseAuth
import Firebase

class ViewController: UIViewController {

    @IBOutlet weak var emailTextField: UITextField!
    @IBOutlet weak var passwordTextField: UITextField!


    override func viewDidLoad() {
        super.viewDidLoad()

    }

    @IBAction func createAccountTapped(_ sender: Any) {
        if let email = emailTextField.text, let password = passwordTextField.text {
            Auth.auth().createUser(withEmail: email, password: password, completion: { user, error in
                if let firebaseError = error {
                    print(firebaseError.localizedDescription)
                    return
                }
                self.presentLoggedInScreen()
            })
        }
    }
    @IBAction func loginTapped(_ sender: Any) {
        if let email = emailTextField.text, let password = passwordTextField.text {
            Auth.auth().signIn(withEmail: email, password: password, completion: { (user, error) in
                if let firebaseError = error {
                    print(firebaseError.localizedDescription)
                    return
                }
                self.presentLoggedInScreen()
            })
        }
    }
    func presentLoggedInScreen() {
        let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let loggedInVC:LoggedInVC = storyboard.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
        self.present(loggedInVC, animated: true, completion: nil)
    }
}

错误在withIdentifier部分的这一行中，当我想运行它时，总是说“参数传递给不带参数的调用”：

let loggedInVC:LoggedInVC = storyboard.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC

Answer 1

instantiateInitialViewController使用无参数，它只是初始化故事板的第一个视图控制器。您正在寻找instantiateViewController。

let loggedInVC = storyboard.instantiateViewController(withIdentifier:"LoggedInVC") as! LoggedInVC

Answer 2

请勿使用此代码

<div id="modal_form"> 
      <span>Some text in modal window</span>  
</div>

查找第一行。您实例化需要内存的新Main.Storyboard。使用已经在内存中的故事板。

func presentLoggedInScreen() {
        let storyboard:UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
        let loggedInVC:LoggedInVC = storyboard.instantiateInitialViewController(withIdentifier:"LoggedInVC") as! LoggedInVC
        self.present(loggedInVC, animated: true, completion: nil)
    }

错误：参数传递给不带参数的调用

2 个答案: