如何将编码键用于符合代码协议的枚举

Question

我有一个EmailVerificationStatus枚举，其类型为String，该类型符合Codable协议：

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

我正在使用的Web服务在大写（UNVERIFIED/VERIFIED）中发送这些案例。如何使用CodingKeys枚举来映射这种差异？像以下内容不起作用：

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

Answer 1

好。那很简单。无需CodingKeys：

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

Answer 2

这就是我通常这样做的方式：

struct EmailVerificationStatus: String, Codable {
    var unverified: String
    var verified: String
    enum CodingKeys: String, CodingKey {
        case unverified = "UNVERIFIED"
        case verified = "VERIFIED"
    }
}

Answer 3

我建议您将struct用于电子邮件...键入枚举编码键并在结构内嵌套。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 4

当您的枚举具有关联的值是将Codable合规性纳入扩展名时，它会有所帮助，然后它不会抱怨您实现codingkeys enum。

类似的东西：

enum EmailVerificationStatus: String {
    case unverified
    case verified(email:String)
}
extension EmailVerificationStatus: Codable {
  enum CodingKeys: String, CodingKey {
    case unverified = "UNVERIFIED"
    case verified = "VERIFIED"
  }
}