Moving data from Model to destination ViewController with segue - swift

Question

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 :
TopicsViewController:
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
}
}
}
QuizViewController:
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)
}
}

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 .