Ios Xcode 12.2安全密码文本字段异常行为

我创建了一个注册视图控制器，其中包含3个文本字段，分别用于电子邮件、用户名和密码。以下是整个视图控制器文件：

//
//  SignupViewController.swift
//  bounce_frontend
//
//  Created by Sebastian Fay on 11/21/20.
//

import UIKit

class SignupViewController: UIViewController {
    
    struct Constants {
        static let cornerRadius: CGFloat = 5.0
    }
    
    private let emailField: UITextField = {
        let field = UITextField()
        field.placeholder = "Email"
        field.returnKeyType = .next
        field.leftViewMode = .always
        field.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 0))
        field.autocapitalizationType = .none
        field.autocorrectionType = .no
        field.layer.masksToBounds = true
        field.layer.cornerRadius = Constants.cornerRadius
        field.backgroundColor = .secondarySystemBackground
        field.layer.borderWidth = 1.0
        field.layer.borderColor = UIColor.secondaryLabel.cgColor
        return field
    }()
    
    private let usernameField: UITextField = {
        let field = UITextField()
        field.placeholder = "Username"
        field.returnKeyType = .next
        field.leftViewMode = .always
        field.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 0))
        field.autocapitalizationType = .none
        field.autocorrectionType = .no
        field.layer.masksToBounds = true
        field.layer.cornerRadius = Constants.cornerRadius
        field.backgroundColor = .secondarySystemBackground
        field.layer.borderWidth = 1.0
        field.layer.borderColor = UIColor.secondaryLabel.cgColor
        return field
    }()
    
    private let passwordField: UITextField = {
        let field = UITextField()
        field.isSecureTextEntry = true
        field.textContentType = .oneTimeCode
        field.placeholder = "Password"
        field.returnKeyType = .next
        field.leftViewMode = .always
        field.leftView = UIView(frame: CGRect(x: 0, y: 0, width: 10, height: 0))
        field.autocapitalizationType = .none
        field.autocorrectionType = .no
        field.layer.masksToBounds = true
        field.layer.cornerRadius = Constants.cornerRadius
        field.backgroundColor = .secondarySystemBackground
        field.layer.borderWidth = 1.0
        field.layer.borderColor = UIColor.secondaryLabel.cgColor
        return field
    }()
    
    private let createAccountButton: UIButton = {
        let button = UIButton()
        button.setTitle("Create account", for: .normal)
        button.layer.masksToBounds = true
        button.layer.cornerRadius = Constants.cornerRadius
        button.backgroundColor = .systemRed
        button.setTitleColor(.white, for: .normal)
        return button
    }()
    

    override func viewDidLoad() {
        super.viewDidLoad()
        
        createAccountButton.addTarget(self, action: #selector(didTapCreateAccountButton), for: .touchUpInside)
        
        emailField.delegate = self
        usernameField.delegate = self
        passwordField.delegate = self
        
        addSubviews()
        view.backgroundColor = .systemBackground
        // Do any additional setup after loading the view.
    }
    
    private func addSubviews() {
        view.addSubview(emailField)
        view.addSubview(usernameField)
        view.addSubview(passwordField)
        view.addSubview(createAccountButton)
    }
    
    override func viewDidLayoutSubviews() {
        super.viewDidLayoutSubviews()
        
        emailField.frame = CGRect(x: 20, y: view.safeAreaInsets.top + 100, width: view.width-40, height: 52)
        usernameField.frame = CGRect(x: 20, y: emailField.bottom + 10, width: view.width-40, height: 52)
        passwordField.frame = CGRect(x: 20, y: usernameField.bottom + 10, width: view.width-40, height: 52)
        createAccountButton.frame = CGRect(x: 20, y: passwordField.bottom + 10, width: view.width-40, height: 52)
    }
    
    @objc private func didTapCreateAccountButton() {
        print("creating account")
        emailField.resignFirstResponder()
        usernameField.resignFirstResponder()
        passwordField.resignFirstResponder()
        
        guard let userEmail = emailField.text, !userEmail.isEmpty, let userUsername = usernameField.text, !userUsername.isEmpty, let userPassword = passwordField.text, !userPassword.isEmpty, userPassword.count >= 8 else {
            return
        }
        
        // check if the email and username are available
        AuthManager.shared.emailUsernameAvailable(email: userEmail, username: userUsername) { areAvailable in
            if areAvailable {
                print("username and email are available")
            } else {
                print("username and email are NOT available")
            }
        }
    }

}

extension SignupViewController: UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        if textField == emailField {
            usernameField.becomeFirstResponder()
        } else if textField == usernameField {
            passwordField.becomeFirstResponder()
        } else if textField == passwordField {
            didTapCreateAccountButton()
        }
        return true
    }
}

它们的布局如下：

在模拟器中，当我单击密码文本字段时，文本字段变为黄色并显示“强密码”，同时还隐藏输入的文本：。

但是，我也意识到，如果我在电子邮件和用户名文本字段之前单击密码文本字段，文本字段的行为与预期的一样：

---

我读过其他帖子，说XCode推断视图的目的可能是从文件名和变量名注册，这可能会导致错误，但我还没有找到解决此特定情况的方法。谢谢

我的第一印象是，视图控制器中有一个逻辑，它有副作用。超过你的控制器代码

覆盖文本字段内容的附加“密码”标签是预期行为，因为您激活了该选项，称为密码自动填充

要完全激活此功能，您必须启用应用程序的关联域

---

如果不可能，那么只需将textContentType设置为.password，并将isSecureTextEntry设置为true。

我的第一印象是，视图控制器中有一个具有副作用的逻辑。超过你的控制器代码

覆盖文本字段内容的附加“密码”标签是预期行为，因为您激活了该选项，称为密码自动填充

要完全激活此功能，您必须启用应用程序的关联域

如果不可能，只需将textContentType设置为.password，并将isSecureTextEntry设置为true