Swift 为什么我的enum会说；ErrorType“；

当我将鼠标悬停在randomAnswer=AnswerType.types[RandomNumeric].rawValue上时，我看到一个弹出框显示错误类型。我不明白为什么Playerd认为有错误

我在Playerd中复制粘贴了您的代码，我看到的唯一错误是两个枚举的“static let types”中“shortAnswerm”末尾的字符“m”。除此之外，一切正常

我将您的代码复制粘贴到游乐场，我看到的唯一错误是两个枚举的“static let types”中“shortAnswerm”末尾的字符“m”。除此之外一切都好。谢谢。把它作为答案贴出来，我会把它标对的。谢谢

class Question {
    var type: QuestionType
    var query: String
    var answer: String

    init(type: QuestionType, query: String, answer: String) {
        self.type = type
        self.query = query
        self.answer = answer
    }
}


enum QuestionType: String {
    case trueFalse = "The sky is blue."
    case multipleChoice = "Who is the ugliest Beatle: John, Paul, George or Ringo?"
    case shortAnswer = "What is the capital of Oregon?"
    case essay = "In 50 words, explain moleceular fusion"

    static let types = [trueFalse, multipleChoice, shortAnswerm, essay]
}

enum AnswerType: String {
    case trueFalse = "true"
    case multipleChoice = "Sgt. Pepper"
    case shortAnswer = "Salem"
    case essay = "Molecular fusion happens when a daddy molecule and a mommy molecule love each other very much"

    static let types = [trueFalse, multipleChoice, shortAnswerm, essay]
}


protocol QuestionGenerator {
    func generateRandomQuestion() -> Question
}

class Quiz: QuestionGenerator {
    func generateRandomQuestion() -> Question {
        let randomNumeral = Int(arc4random_uniform(4))
        let randomType = QuestionType.types[randomNumeral]
        let randomQuery = randomType.rawValue
        let randomAnswer = AnswerType.types[randomNumeral].rawValue
        let randomQuestion = Question(type: randomType, query: randomQuery, answer: randomAnswer)
        return randomQuestion
    }
}