I'm newbie to Xcode and Swift.

This is my first program.

I include the full code.

I get this error and I don't know how to solve it.

The program builds ok, but when I run it I get this error.

Thread 1: Fatal error: init(coder:) has not been implemented

I appreciate if you provide a coded solution.

This is the ResultView Controller.swift file.

//
//  ResultsViewController.swift
//  PersonalityQuiz
//
//  Created by Ricardo E. Marrero Guzmán on 12/16/21.
//

import UIKit

class ResultsViewController: UIViewController {

    @IBOutlet var resultAnswerLabel: UILabel!
    @IBOutlet var resultDefinitionLabel: UILabel!
    
    var responses: [Answer]  // Esto provoca un error.  Para quitarlo se añade el siguiente init?...
    
    init?(coder: NSCoder, responses: [Answer]) {  // Este init?... provoca otro error.  Se le da fix y se crea el siguiente required init?...
        self.responses = responses
        super.init(coder: coder)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented") // Thread 1: Fatal error: init(coder:) has not been implemented
    }

override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        calculatePersonalityResults()
        navigationItem.hidesBackButton = true
    }
    
    func calculatePersonalityResults() {
        
        let frecuencyOfAnswers = responses.reduce(into: [:]) {
            (counts, answer) in counts[answer.type, default: 0]  = 1
        }
let frequentAnswersStored = frecuencyOfAnswers.sorted(by:
        { (pair1, pair2) in
            return pair1.value > pair2.value
        })
        
        let mostCommonAnswer = frequentAnswersStored.first!.key
        
        resultAnswerLabel.text = "You are \(mostCommonAnswer.rawValue)!"
        resultDefinitionLabel.text = mostCommonAnswer.definition

}

This is de QuestionViewController.swift file

//
//  QuestionViewController.swift
//  PersonalityQuiz
//
//  Created by Ricardo E. Marrero Guzmán on 12/16/21.
//

import UIKit

class QuestionViewController: UIViewController {
    
    @IBOutlet var questionLabel: UILabel!
    
    @IBOutlet var singleStackView: UIStackView!
    @IBOutlet var singleButton1: UIButton!
    @IBOutlet var singleButton2: UIButton!
    @IBOutlet var singleButton3: UIButton!
    @IBOutlet var singleButton4: UIButton!
    
    @IBOutlet var multipleStackView: UIStackView!
    @IBOutlet var multiLabel1: UILabel!
    @IBOutlet var multiLabel2: UILabel!
    @IBOutlet var multiLabel3: UILabel!
    @IBOutlet var multiLabel4: UILabel!
    
    @IBOutlet var multiSwitch1: UISwitch!
    @IBOutlet var multiSwitch2: UISwitch!
    @IBOutlet var multiSwitch3: UISwitch!
    @IBOutlet var multiSwitch4: UISwitch!
    
    @IBOutlet var rangedStackView: UIStackView!
    @IBOutlet var rangedLabel1: UILabel!
    @IBOutlet var rangedLabel2: UILabel!
    
    @IBOutlet var rangedSlider: UISlider!
    
    @IBOutlet var questionProgressView: UIProgressView!

var answersChosen: [Answer] = [] // No se donde va esto
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
        
        updateUI()
        
    }
    
    @IBAction func singleAnswerButtonPressed(_ sender: UIButton) {
        let currentAnswers = questions[questionIndex].answers
        
        switch sender {
        case singleButton1:
            answersChosen.append(currentAnswers[0])
        case singleButton2:
            answersChosen.append(currentAnswers[1])
        case singleButton3:
            answersChosen.append(currentAnswers[2])
        case singleButton4:
            answersChosen.append(currentAnswers[3])
        default:
            break
        }
        
        nextQuestion()
    }
    
    @IBAction func multipleAnswerButtonPressed() {
        let currentAnswers = questions[questionIndex].answers
        
        if multiSwitch1.isOn {
            answersChosen.append(currentAnswers[0])
        }
        if multiSwitch2.isOn {
            answersChosen.append(currentAnswers[1])
        }
        if multiSwitch3.isOn {
            answersChosen.append(currentAnswers[2])
        }
        if multiSwitch4.isOn {
            answersChosen.append(currentAnswers[3])
        }
        
        nextQuestion()
    }
    
    @IBAction func rangedAnswerButtonPressed() {
        let currentAnswers = questions[questionIndex].answers
        
        let index = Int(round(rangedSlider.value * Float(currentAnswers.count - 1)))
        
        answersChosen.append(currentAnswers[index])
        
        nextQuestion()
    }
    
    func updateUI() {
        singleStackView.isHidden = true
        multipleStackView.isHidden = true
        rangedStackView.isHidden = true
        
        let currentQuestion = questions[questionIndex]
        let currentAnswers = currentQuestion.answers
        let totalProgress = Float(questionIndex) / Float(questions.count)
        
        navigationItem.title = "Question #\(questionIndex   1)"
        questionLabel.text = currentQuestion.text
        questionProgressView.setProgress(totalProgress, animated: true)
        
        switch currentQuestion.type {
        case .single:
            singleStackView.isHidden = false
            updateSingleStack(using: currentAnswers)
        case .multiple:
            multipleStackView.isHidden = false
            updateMultipleStack(using: currentAnswers)
        case .ranged:
            rangedStackView.isHidden = false
            updateRangedStack(using: currentAnswers)
        }
    }
    
    func updateSingleStack(using answers: [Answer]) {
        singleStackView.isHidden = false
        singleButton1.setTitle(answers[0].text, for: .normal)
        singleButton2.setTitle(answers[1].text, for: .normal)
        singleButton3.setTitle(answers[2].text, for: .normal)
        singleButton4.setTitle(answers[3].text, for: .normal)
    }
    
    func updateMultipleStack(using answers: [Answer]) {
        multipleStackView.isHidden = false
        
        multiSwitch1.isOn = false
        multiSwitch2.isOn = false
        multiSwitch3.isOn = false
        multiSwitch4.isOn = false
        
        multiLabel1.text = answers[0].text
        multiLabel2.text = answers[1].text
        multiLabel3.text = answers[2].text
        multiLabel4.text = answers[3].text
    }
    
    func updateRangedStack(using answers: [Answer]) {
        rangedStackView.isHidden = false
        
        rangedSlider.setValue(0.5, animated: false)
        
        rangedLabel1.text = answers.first?.text
        rangedLabel2.text = answers.last?.text
    }
    
    func nextQuestion() { // Este es el método más importante del programa y lo que hace correr el app bien.
        questionIndex  = 1
        
        if questionIndex < questions.count {
            updateUI()
        } else {
            performSegue(withIdentifier: "Results", sender: nil)
        }
    }

    @IBSegueAction func showResults(_ coder: NSCoder) -> ResultsViewController? {
        return ResultsViewController(coder: coder, responses: answersChosen)
    }

This is the Question.swift file.

//
//  Question.swift
//  PersonalityQuiz
//
//  Created by Ricardo E. Marrero Guzmán on 12/17/21.
//

import Foundation

struct Question {
    var text: String
    var type: ResponseType
    var answers: [Answer]
}

enum ResponseType {
    case single, multiple, ranged
}

struct Answer {
    var text: String
    var type: AnimalType
}

enum AnimalType: Character {
    case dog = "