moving data from Model to destination ViewController with segue

I am new to swift and programming in general. I am building a quiz app. The app uses TopicsViewController to select a topic and segue to a QuestionsViewController. The questions for the various topics are stored as separate swift Objects file. I would like to pick the Topic1 Question file when I press the topic1 button in TopicsViewController to segue into the QuestionsViewController. I would like to know how can I select the particular questions file QuestionBank1/QuestionBank2 when I select the particular topic upon segueing to the QuestionsViewController?
Navigation Pane
Main.Storyboard
import UIKit
class TopicsViewController: UIViewController, returnToTopicVCDelegate

func goToTopicVC()


override func viewDidLoad()
super.viewDidLoad()


@IBAction func goToQuestionsVCWhenPressed(_ sender: UIButton)
performSegue(withIdentifier: "segueToQuestionVC", sender: self)


override func prepare(for segue: UIStoryboardSegue, sender: Any?)
if segue.identifier == "segueToQuestionVC"
let quizVC = segue.destination as! QuizViewController
quizVC.delegate = self




import UIKit
import QuartzCore

protocol returnToTopicVCDelegate
func goToTopicVC()


class QuizViewController: UIViewController

var delegate : returnToTopicVCDelegate?

//outlet for the question label and image view
@IBOutlet weak var questionLabel: UILabel!
@IBOutlet weak var questionImageView: UIImageView!
//outlet for the buttons
@IBOutlet weak var optionAButton: UIButton!
@IBOutlet weak var optionBButton: UIButton!
@IBOutlet weak var optionCButton: UIButton!
@IBOutlet weak var optionDButton: UIButton!
@IBOutlet weak var optionEButton: UIButton!
//outlets for the progress
@IBOutlet weak var questionCounter: UILabel!
@IBOutlet weak var scoreLabel: UILabel!

var allQuestions = QuestionBank()
var selectedAnswer : Int = 0 // answer selected by the subject
var questionNumber: Int = 0
var score: Int = 0

// functions executed after an answer is picked
@IBAction func answerPressed(_ sender: UIButton)
if sender.tag == selectedAnswer
print("correct answer")
sender.backgroundColor = .green
score += 1
else
print("wrong")
sender.backgroundColor = .red
print("(allQuestions.list[questionNumber].correctAnswer)")
//the following two lines change the right answer button to green using the tag value of the button
let correctAnswerButton = view.viewWithTag(selectedAnswer) as? UIButton
correctAnswerButton?.backgroundColor = UIColor.green



@IBAction func GoToNextQuestion(_ sender: UIButton)
questionNumber += 1
nextQuestion()


// selects a new questions and updates the score

func nextQuestion()
if questionNumber <= allQuestions.list.count - 1
questionLabel.text = allQuestions.list[questionNumber].question
questionImageView.image = UIImage(named: (allQuestions.list[questionNumber].questionImage))
optionAButton.setTitle(allQuestions.list[questionNumber].optionA, for: UIControlState.normal)
optionBButton.setTitle(allQuestions.list[questionNumber].optionB, for: UIControlState.normal)
optionCButton.setTitle(allQuestions.list[questionNumber].optionC, for: UIControlState.normal)
optionDButton.setTitle(allQuestions.list[questionNumber].optionD, for: UIControlState.normal)
optionEButton.setTitle(allQuestions.list[questionNumber].optionE, for: UIControlState.normal)
selectedAnswer = allQuestions.list[questionNumber].correctAnswer
updateUI()
else
let alert = UIAlertController(title: "Great!", message: "Do you want to start over?", preferredStyle: .alert)
let restartAction = UIAlertAction(title: "Restart", style: .default) (UIAlertAction) in
self.restartQuiz()

alert.addAction(restartAction)
present(alert, animated: true, completion: nil)




func updateUI()
scoreLabel.text = "score: (score)"
questionCounter.text = "(questionNumber + 1)/(allQuestions.list.count)"


func restartQuiz()
score = 0
questionNumber = 0
nextQuestion()



@IBAction func goBackToTopicsVC(_ sender: Any)
delegate?.goToTopicVC()
dismiss(animated: true, completion: nil)




indexPath.row

1 Answer
1

You can use the following steps :

1- Add a segue from TopicsViewController to QuestionsViewController and give the segue "Identifier Name " from Attributes inspector.

2- Add a variable in QuestionsViewController for the topic lets name it "topicType".

3- Override the below function in TopicsViewController and send the name of the topic with the segue:

override func prepare(for segue: UIStoryboardSegue, sender: Any?)
if segue.identifier == "Identifier Name"
if let destinationviewController = segue.destination as? QuestionsViewController , let buttonPressed = sender as? UIButton
destinationviewController.topicType = buttonPressed.currentTitle!





4- For each button in TopicsViewController , get the button action and type the following function in it :

@IBAction func topicButton(_ sender: UIButton)

performSegue(withIdentifier: "Identifier Name", sender: nil)




I hope this helps you .

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