本地 JSON 枚舉解碼

Question

如何在我的模型中將 JSON 解碼為 Enum？ 我哪里做錯了？ 如果你願意，我可以分享我的 Json 解碼代碼，但我的 json 解碼代碼工作正常。

錯誤：

typeMismatch(Swift.String, Swift.DecodingError.Context(codingPath: [CodingKeys(stringValue: "questions", intValue: nil), _JSONKey(stringValue: "Index 0", intValue: 0), CodingKeys(stringValue: "sections", intValue: nil)], debugDescription: "Expected to decode String but found a dictionary instead.", underlyingError: nil))
Question_App/JSONProvider.swift:55: Fatal error: Error decoding JSON

本地 JSON

{
    questions: [
        ....
        {
            "number": 1,
            "question": "What is the chemical formula for water ?",
            "sections": {
                "A": "CO2",
                "B": "H2O",
                "C": "C2H6O",
                "D": "H2N"
            },
            "price": 5,
            "correct": 1
        },
        ....
    ]
}

模型

struct QuestionContainer: Codable, Hashable {
    var questions: [Question]?
}

enum Section: String, Codable, Hashable {
    case A, B, C, D
}

struct Question: Codable, Hashable {
    var number: Int?
    var question: String?
    var sections: Section?
    var price: Int?
    var correct: Int?
}

Answer 1

Question上的sections屬性需要是字典

struct Question: Codable, Hashable {
    var number: Int?
    var question: String?
    var sections: [Section: String]?
    var price: Int?
    var correct: Int?
}

Answer 2

如果您有靜態 4 個鍵

struct Section: Codable, Hashable {
    var a, b, c, d:String
    private enum CodingKeys: String, CodingKey {
       case a = "A"
       case b = "B"
       case c = "C"
       case d = "D"
    }
}

否則使用字典