Create signup page with username,password,email and confirm password using rxswift

 Solution:

Using signUpViewModel

import RxSwift

import RxCocoa

class SignupViewModel {

    

    let username = BehaviorRelay<String>(value: "")

    let password = BehaviorRelay<String>(value: "")

    let email = BehaviorRelay<String>(value: "")

    let confirmPassword = BehaviorRelay<String>(value: "")

    

    let usernameValid: Observable<Bool>

    let passwordValid: Observable<Bool>

    let emailValid: Observable<Bool>

    let confirmPasswordValid: Observable<Bool>

    let signupEnabled: Observable<Bool>

    

    init() {

        usernameValid = username.asObservable().map { $0.count >= 10 }

        passwordValid = password.asObservable().map { $0.count >= 8 }

        emailValid = email.asObservable().map { $0.contains("@") && $0.contains(".") }

        confirmPasswordValid = Observable.combineLatest(password.asObservable(), confirmPassword.asObservable()) {

            password, confirmPassword in

            return password == confirmPassword

        }

        

        signupEnabled = Observable.combineLatest(usernameValid, passwordValid, emailValid, confirmPasswordValid) {

            $0 && $1 && $2 && $3

        }

    }

    

}

Using signupViewController

import UIKit

import RxSwift

import RxCocoa

class SignupViewController: UIViewController {

  @IBOutlet weak var usernameTextField: UITextField!

  @IBOutlet weak var passwordTextField: UITextField!

  @IBOutlet weak var emailTextField: UITextField!

  @IBOutlet weak var confirmPasswordTextField: UITextField!

  @IBOutlet weak var signupButton: UIButton!

  let viewModel = SignupViewModel()

  let disposeBag = DisposeBag()

  override func viewDidLoad() {

    super.viewDidLoad()

    usernameTextField.rx.text.orEmpty

      .bind(to: viewModel.username)

      .disposed(by: disposeBag)

    passwordTextField.rx.text.orEmpty

      .bind(to: viewModel.password)

      .disposed(by: disposeBag)

    emailTextField.rx.text.orEmpty

      .bind(to: viewModel.email)

      .disposed(by: disposeBag)

    confirmPasswordTextField.rx.text.orEmpty

      .bind(to: viewModel.confirmPassword)

      .disposed(by: disposeBag)

    viewModel.signupEnabled

      .bind(to: signupButton.rx.isEnabled)

      .disposed(by: disposeBag)

    signupButton.rx.tap

      .subscribe(onNext: { [weak self] in

        guard let self = self else { return }

        print("Signup username: \(self.viewModel.username.value)")

      })

      .disposed(by: disposeBag)

  }

}