如何将CodingKeys用于符合Codable协议的枚举？

Question

我有一个EmailVerificationStatus枚举，其关联类型String符合Codable协议：

enum EmailVerificationStatus: String, Codable {
    case unverified
    case verified
}

我正在使用的网络服务以大写形式发送这些案例（UNVERIFIED / VERIFIED）。如何使用CodingKeys枚举来映射这种差异？像下面这样的东西不起作用：

enum CodingKeys: String, CodingKey {
    case unverified = "UNVERIFIED"
    case verified = "VERIFIED"
}

Answer 1

确定。这很简单。不需要CodingKeys：

enum EmailVerificationStatus: String, Codable {
    case verified = "VERIFIED"
    case unverified = "UNVERIFIED"
}

Answer 2

我建议你使用struct for the email ...类型并将enum CodingKeys嵌套在你的struct中。 CodingKeys允许您使用源数据案例（来自webservice）映射结构变量。

struct EmailVerificationStatus: String, Codable {
        var unverified: String
        var verified: String

        enum CodingKeys: String, CodingKey {
            case unverified = "UNVERIFIED"
            case verified = "VERIFIED"
        }
    }

Answer 3

这是我通常的做法：

struct EmailVerificationStatus: String, Codable {
    var unverified: String
    var verified: String

    enum CodingKeys: String, CodingKey {
        case unverified = "UNVERIFIED"
        case verified = "VERIFIED"
    }
}