Quiz app option button background color change - ios

Question

When we click on the wrong option in the quiz application, the background color is red and the background color of the correct option is green. how can I do that? My model :
struct QuizModel {
let q : String
let a : [String]
let correctAnswer : Int
}
my question :
QuizModel(q: "Aşağıdakilerden hangisi ilk yardımın amaçlarından biri değildir?", a: [
"A) İlaçla tedavi etmek","B) Durumun kötüleşmesini önlemek","C) Hayati tehlikeyi ortadan kaldırmak","D) Yaşamsal fonksiyonların sürdürülmesini sağlamak"], correctAnswer: 0)
answer func :
func checkAnswer(userAnswer : Int)-> Bool {
if userAnswer == quiz[questionNumber ].correctAnswer {
return true
}else{
return false
}
}
user tapped option button :
#objc func TappedButton(_ sender : UIButton){
let userAnswer = sender.tag
let userRightGot = quizBrains.checkAnswer(userAnswer: userAnswer)
if userRightGot {
sender.backgroundColor = .green
score += 1
scoreLabel.text = "\(score)"
}else{
sender.backgroundColor = .red
failScore += 1
failScoreLabel.text = "\(failScore)"
}

Answer 1

The method affects only the currently tapped button, you have to update the state of the other buttons, too.
Something like this, button0-button3 are the references to the buttons, you have to add IBOutlets if there are none.
var buttons = [button0, button1, button2, button3]
// please name methods with starting lowercase letter
#objc func tappedButton(_ sender : UIButton) {
let userAnswer = sender.tag
let correctAnswer = quiz[questionNumber].correctAnswer
for button in buttons {
button.backgroundColor = button.tag == correctAnswer ? .green : .red
}
if userAnswer == correctAnswer {
score += 1
scoreLabel.text = "\(score)"
} else {
failScore += 1
failScoreLabel.text = "\(failScore)"
}
}