arrays - 按下按钮时尝试检查答案

Question

每个按钮都有不同的答案。我打算通过与索引号匹配来进行检查，但当尝试输入按钮操作时，它显示未解析的标识符randomIndex。还有其他方法可以检查答案或使其起作用吗？

override func viewDidLoad() {
    super.viewDidLoad()

    for _ in 1...3 {
        randomQuestion(queModel: questionModel)

    }

}
func randomQuestion(queModel queModel:QuestionModel){
    let questions = queModel.questions
    let randomIndex = Int(arc4random_uniform(UInt32(questions.count)))

    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)

    // CorrectAnswer = "\(questions[randomIndex].correctAnswerIndex)"

}


@IBAction func ActBtn_A(sender: AnyObject) {
}

@IBAction func ActBtn_B(sender: AnyObject) {
}

@IBAction func ActBtn_C(sender: AnyObject) {
}

@IBAction func ActBtn_D(sender: AnyObject) {         
}

Answer 1

只需在 randomQuestion 函数外部声明您的 randomIndex 即可，如下所示:

var randomIndex = 0

func randomQuestion(queModel queModel:QuestionModel){
    let questions = queModel.questions
    randomIndex = Int(arc4random_uniform(UInt32(questions.count)))

    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)

    // CorrectAnswer = "\(questions[randomIndex].correctAnswerIndex)"

}

现在您可以在类中的任何方法中读取randomIndex。