没有成员名称 'subscript' - SWIFT

Question

我正在构建一个问答应用程序，并且我已经制作了一个 class 用于创建问题。我还制作了一个将在 viewDidLoad() 时加载的函数。

 class Question{
    var quizQuestion : String = ""
    var firstAnswer : String = ""
    var secondAnswer : String = ""
    var thirdAnswer : String = ""
    var fourthAnswer : String = ""
    var rightAnswer : Int = 0

init(question:String, answerOne:String, answerTwo:String, answerThree:String, answerFour:String, correctAnswer:Int)
{

    self.quizQuestion = question
    self.firstAnswer = answerOne
    self.secondAnswer = answerTwo
    self.thirdAnswer = answerThree
    self.fourthAnswer = answerFour
    self.rightAnswer = correctAnswer
    }
}


let one = Question(question: "What was the first planet to be discovered using a telescope, in 1781?", answerOne: "Mars", answerTwo: "Jupiter", answerThree: "Uranus", answerFour: "Mercury", correctAnswer: 3)

我的 initialState() 函数

 func initialState() {
    var firstQuestion: AnyObject = arrayOfQuestions[0]

    currentQuestion = 0



    questionLabel.text = "\(firstQuestion[0])"

    //Setting the buttons text
    firstAnswer.setTitle("\(firstQuestion[1])", forState: UIControlState.Normal)
    secondAnswer.setTitle("\(firstQuestion[2])", forState: UIControlState.Normal)
    thirdAnswer.setTitle("\(firstQuestion[3])", forState: UIControlState.Normal)
    fourthAnswer.setTitle("\(firstQuestion[4])", forState: UIControlState.Normal)
}

当我想将按钮文本设置为问题和答案的索引时，它说 'Question' 没有名为 'subscript' 的成员，这对我来说毫无意义。当我运行该应用程序时，所有内容都设置为 "nil."

有人可以帮忙吗？请解释你的答案，因为我正在努力学习语言和错误。

Answer 1

questionLabel.text = "\(firstQuestion.quizQuestion)"

//Setting the buttons text
firstAnswer.setTitle("\(firstQuestion.firstAnswer)", forState: UIControlState.Normal)
secondAnswer.setTitle("\(firstQuestion.secondAnswer)", forState: UIControlState.Normal)
thirdAnswer.setTitle("\(firstQuestion.thirdAnswer)", forState: UIControlState.Normal)
fourthAnswer.setTitle("\(firstQuestion.fourthAnswer)", forState: UIControlState.Normal)

Answer 2

重组代码以使用答案数组。它会更容易管理。也给出正确答案作为数组的索引。

class Question{
    var quizQuestion : String = ""
    var answers : Array<String> = Array()
    var rightAnswer : Int = 0

    init(question:String, answerOne:String, answerTwo:String, answerThree:String, answerFour:String, correctAnswer:Int)
    {
        self.quizQuestion = question
        self.answers.append(answerOne)
        self.answers.append(answerTwo)
        self.answers.append(answerThree)
        self.answers.append(answerFour)
        self.rightAnswer = correctAnswer
    }
}

let one = Question(question: "What was the first planet to be discovered using a telescope, in 1781?",
answerOne: "Mars", answerTwo: "Jupiter", answerThree: "Uranus", answerFour: "Mercury", correctAnswer: 3)



func initialState() {
    var firstQuestion: Question = arrayOfQuestions[0]

    questionLabel.text = "\(firstQuestion.quizQuestion)"

    //Setting the buttons text
    firstAnswer.setTitle("\(firstQuestion.answers[0])", forState: UIControlState.Normal)
    secondAnswer.setTitle("\(firstQuestion.answers[1])", forState: UIControlState.Normal)
    thirdAnswer.setTitle("\(firstQuestion.answers[2])", forState: UIControlState.Normal)
    fourthAnswer.setTitle("\(firstQuestion.answers[3])", forState: UIControlState.Normal)
}

没有成员名称 'subscript' - SWIFT

does not have a member names 'subscript' - SWIFT

xcode

ios

swift