swift - QUIZ 应用程序... UIAlertController 没有出现并且没有重新启动回到最初的问题

Question

我认为 nextQuestion() 和 startOver() 函数给我带来了麻烦......当我浏览问题时，它会结束并且不会在屏幕上弹出警报必须点击 True 或 false ，然后它会 startOver() 但随后它会跳过第一个问题并直接进入第二个问题

导入UIKit

ViewController 类:UIViewController {

//Place your instance variables here
let allQuestions = QuestionBank()
var pickedAnswer : Bool = false
var questionNumber : Int = 0

@IBOutlet weak var questionLabel: UILabel!
@IBOutlet weak var scoreLabel: UILabel!
@IBOutlet var progressBar: UIView!
@IBOutlet weak var progressLabel: UILabel!

override func viewDidLoad() {
    super.viewDidLoad()

    let firstQuestion = allQuestions.list[0]
    questionLabel.text = firstQuestion.questionText
    //when app loads it will display the first question in the array of question bank
}


@IBAction func answerPressed(_ sender: AnyObject) {
    if sender.tag == 1 {
        pickedAnswer = true
    }
    else if sender.tag == 2 {
        pickedAnswer = false
    }
    //above - will change the picked answer based on which tag # is pressed
    checkAnswer()

    questionNumber = questionNumber + 1

    nextQuestion()

}


func updateUI() {

}


func nextQuestion() {

    if questionNumber <= 12 {
    questionLabel.text = allQuestions.list[questionNumber].questionText
        //if the current questionNumber is equal to or less than 12 then it will change the display text to the current question
    }
    else {

        let alert = UIAlertController(title: "Congrats!", message: "Do you want to restart?", preferredStyle: .alert)

        let restartAction = UIAlertAction(title: "Restart", style: .default, handler: { UIAlertAction in
            self.startOver()
        })

        alert.addAction(restartAction)

        present(alert, animated: true, completion: nil)


    }
}


func checkAnswer() {

    let correctAnswer = allQuestions.list[questionNumber].answer

    if correctAnswer == pickedAnswer {
        print("You got it!")
    }
    else {
        print("Wrong!")
    }
}


func startOver() {
    questionNumber = 0
    nextQuestion()
}

}

Answer 1

这是一个固件问题。刚刚更新到最新的 IOS 13 更新，模拟器运行应用程序没有任何问题，所以我相信我的固件是最新的，而 Xcode 是上一个版本。它在模拟器上运行没有问题。 13.1.1 上的模拟器和我刚刚上传到 13.1.3 的模拟器是唯一的区别。我已经查看了类(class)中完成的应用程序，除了固件之外，它的所有行都相同。 app running on Xcode simulator