Ios 带数组的测验应用程序，无重复问题

可能有一种更好的方法可以使用此应用程序，而不必像我一样重复代码

我试图通过从数组中重复生成一个不同的问题。但每次“下一步行动”按钮按下几次，它都会多次给我相同的问题，然后它会转到下一个，或者其他时候它只按下一个按钮，然后转到下一个。我知道这是最好的代码，但我还在学习

import UIKit

class TestQuestionsVC: UIViewController {

    @IBOutlet weak var SignImage: UIImageView!

    @IBOutlet weak var AnswerBtn_A: MaterialButton!

    @IBOutlet weak var AnswerBtn_B: MaterialButton!

    @IBOutlet weak var AnswerBtn_C: MaterialButton!

    @IBOutlet weak var AnswerBtn_D: MaterialButton!

    var questionModel = QuestionModel()

    var GuessQuestionNum = ""
    var answer: String = ""
    var btnLatter = ""
    var previousNumber: UInt32? // used in randomNumber()

    override func viewDidLoad() {
        super.viewDidLoad()


            for _ in 1...5 {
                        randomQuestion(queModel: questionModel)

            }


    }


    func randomQuestion(queModel queModel:QuestionModel){

        let questions = queModel.questions
        let randomIndex = Int(arc4random_uniform(UInt32(questions.count)))

        answer = "\(questions[randomIndex].answers[questions[randomIndex].correctAnswerIndex])"

        SignImage.image = questions[randomIndex].question
        AnswerBtn_A.setTitle("\(questions[randomIndex].answers[0])", forState: .Normal)
        AnswerBtn_B.setTitle("\(questions[randomIndex].answers[1])", forState: .Normal)
        AnswerBtn_C.setTitle("\(questions[randomIndex].answers[2])", forState: .Normal)
        AnswerBtn_D.setTitle("\(questions[randomIndex].answers[3])", forState: .Normal)

        }




    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

    @IBAction func ActBtn_A(sender: AnyObject) {

        GuessQuestionNum = (AnswerBtn_A.titleLabel?.text)!
        if GuessQuestionNum == answer {
            AnswerBtn_A.backgroundColor = GREEN_COLOR
        } else {
            AnswerBtn_A.backgroundColor = RED_COLOR

        }

            }

    @IBAction func ActBtn_B(sender: AnyObject) {
        GuessQuestionNum = (AnswerBtn_B.titleLabel?.text)!
        if GuessQuestionNum == answer {
            AnswerBtn_B.backgroundColor = GREEN_COLOR
        } else {
        AnswerBtn_B.backgroundColor = RED_COLOR
        }
    }

    @IBAction func ActBtn_C(sender: AnyObject) {
        GuessQuestionNum = (AnswerBtn_C.titleLabel?.text)!

        if GuessQuestionNum == answer {
            AnswerBtn_C.backgroundColor = GREEN_COLOR
        } else {
            AnswerBtn_C.backgroundColor = RED_COLOR
        }
    }

    @IBAction func ActBtn_D(sender: AnyObject) {
        GuessQuestionNum = (AnswerBtn_D.titleLabel?.text)!

        if GuessQuestionNum == answer {
            AnswerBtn_D.backgroundColor = GREEN_COLOR
        } else {
            AnswerBtn_D.backgroundColor = RED_COLOR
        }
    }

    @IBAction func NextQuestion(sender: AnyObject) {

        AnswerBtn_A.backgroundColor = BLUE_COLOR
        AnswerBtn_B.backgroundColor = BLUE_COLOR
        AnswerBtn_C.backgroundColor = BLUE_COLOR
        AnswerBtn_D.backgroundColor = BLUE_COLOR

        for _ in 1...5 {
            randomQuestion(queModel: questionModel)

        }
    }


    func randomQuestion( queModel:QuestionModel){

        let questions = queModel.questions

        func randomNumber() -> UInt32 {
            var randomNumber = arc4random_uniform(UInt32(questions.count))
            while previousNumber == randomNumber {
                randomNumber = arc4random_uniform(UInt32(questions.count))
            }
            previousNumber = randomNumber
            return randomNumber
        }


        let randomIndex = Int((UInt32(randomNumber())))

        answer = "\(questions[randomIndex].answers[questions[randomIndex].correctAnswerIndex])"
        SignImage.image = questions[randomIndex].question
        AnswerBtn_A.setTitle("\(questions[randomIndex].answers[0])", forState: .Normal)
        AnswerBtn_B.setTitle("\(questions[randomIndex].answers[1])", forState: .Normal)
        AnswerBtn_C.setTitle("\(questions[randomIndex].answers[2])", forState: .Normal)
        AnswerBtn_D.setTitle("\(questions[randomIndex].answers[3])", forState: .Normal)

    }

}

---

有很多方法可以解决这个问题。我的建议是创建一个问题索引数组。从索引数组中随机删除一个对象，并使用它获取问题。示例代码：

import Foundation


let array = ["one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten"]
var indexes = [Int]();

func randomItem() -> String
{
  if indexes.count == 0
  {
    print("Filling indexes array")
    indexes = (0...array.count-1).map{$0}
  }
  let randomIndex = Int(arc4random_uniform(UInt32(indexes.count)))
  let anIndex = indexes.removeAtIndex(randomIndex)
  return array[anIndex];
}

for i in 1...20
{
  print("random word = \(randomItem())")
}

编写randomItem（）函数是为了在索引数组为空时重新填充索引数组，这样就可以得到一组新的随机问题

请注意，在重新填充数组之后，可以在一行中两次获得相同的问题，因为新数组将包含所有可能的索引，包括使用的最后一个索引。您需要添加额外的逻辑来防止这种情况