Flow example

RegistrationFlow.swift

import Foundation 
 
 
class RegistrationFlow: Flow { 
     
    let phoneNumber: String 
    var registerToken: String 
    var navigationController: UINavigationController? 
    var completion: (() -> Void)? 
     
    init(phoneNumber: String, _ completion: () -> Void) { 
        self.phoneNumber = phoneNumber 
        self.completion = completion 
    } 
     
    func showEntryPage(in controller: UINavigationController) { 
        self.navigationController = controller 
        showOTPInputPage() 
    } 
     
    private func showOTPInputPage() { 
        let page = OTPInputPage() { [weak self] (otp) in 
            requestTokenWithOTP(otp) 
        } 
         
        navigationController?.pushViewController(page, animated: true) 
    } 
     
    private func requestTokenWithOTP(_ otp: String) { 
        API.requestToken(phoneNumber: phoneNumber, otp: otp, scope: .register) { token in 
            self.registerToken = token 
            self.showPasswordInputPage() 
        } 
    } 
     
    private func showPasswordInputPage() { 
        let passwordInputPage = PasswordInputPage() { [weak self] (password) in 
            registerUser(phoneNumber: self?.phoneNumber, password: password) 
        } 
         
        navigationController?.pushViewController(passwordInputPage, animated: true) 
        flow.showEntryPage(navigationController) 
    } 
     
    private func registerUser(phoneNumber: String, password: String) { 
        API.registerUser(phoneNumber: phoneNumber, password: password, token: registerToken) { 
            self.completion() 
        } 
    } 
+
}