Swift 为什么我的一个序列不是'；不行吗？

我正在开发一个测验应用程序，当你正确回答一个问题时，它会转到一个视图控制器，如果你按错了答案，它会转到另一个视图控制器。然而，当我运行模拟器时，如果我点击一个错误的答案，除了倒数计时器重置外，什么也不会发生。然而，如果我点击正确的答案，那么segues就可以正常工作。为什么会这样

这是我的密码：

import UIKit

class ViewController: UIViewController {

    var questionList = [String]()
    var counter = 15
    var timer = Timer()
    var rightAnswerBox:UInt32 = 0
    var index = 0

    //Question Label
    @IBOutlet weak var questionLabel: UILabel!

    @IBOutlet weak var questionTimer: UILabel!


    func updateCounter() {
        counter -= 1
        questionTimer.text = String(counter)

        if counter == 0 {


            timer.invalidate()
            wrongSeg()
        }
    }

    func randomQuestion() {

        //random question
        if questionList.isEmpty {
            questionList = Array(QADictionary.keys)
        }

        let rand = Int(arc4random_uniform(UInt32(questionList.count)))
        questionLabel.text = questionList[rand]


        //matching answer values to go with question keys
        var choices = QADictionary[questionList[rand]]!

        questionList.remove(at: rand)

        //create button
        var button:UIButton = UIButton()

        //variables
        var x = 1
        rightAnswerBox = arc4random_uniform(4)+1


        for index in 1...4
        {
            button = view.viewWithTag(index) as! UIButton

            if (index == Int(rightAnswerBox))
            {
                button.setTitle(choices[0], for: .normal)

            }

            else {
                button.setTitle(choices[x], for: .normal)
                x += 1

            }
        }

        randomImage()

    }

    //dictionary filled with question keys and answer values
    let QADictionary = [:]


    //wrong view segue
    func wrongSeg() {

        performSegue(withIdentifier: "incorrectSeg", sender: self)

    }

    //proceed screen
    func rightSeg() {

        performSegue(withIdentifier: "correctSeg", sender: self)
    }

    //Answer Button
    @IBAction func buttonAction(_ sender: AnyObject) {

        if (sender.tag == Int(rightAnswerBox)) {

            rightSeg()
            timer.invalidate()
            print ("Correct!")
        }

        if counter != 0 {

            counter = 15

        } else if (sender.tag != Int(rightAnswerBox)) {

            wrongSeg()
            print ("Wrong!")
            timer.invalidate()
            questionList = []

        }
    }

    override func viewDidAppear(_ animated: Bool) {

        randomQuestion()

        questionTimer.text = String(counter)
        timer = Timer.scheduledTimer(timeInterval: 1, target:self, selector: #selector(ViewController.updateCounter), userInfo: nil, repeats: true)

    }
}

---

你把错误的条件放在按钮里了，我现在已经纠正了。如果条件允许，只需更换其他部件即可

@IBAction func buttonAction(_ sender: AnyObject) {

        if (sender.tag == Int(rightAnswerBox)) {

            rightSeg()
            timer.invalidate()
            print ("Correct!")
        }/*Here is change*/
      else if (sender.tag != Int(rightAnswerBox)) 
       {

            wrongSeg()
            print ("Wrong!")
            timer.invalidate()
            questionList = []

        }
        if counter != 0 {

            counter = 15

        } 
    }

---

提供故事板的图像，显示segue@DharmeshKheni如何在此处共享项目？