[swift] CodingKeys 사용법

swift:

struct Login: Codable {
    let code: UInt
    let msg: String
    let data: LoginInfo
    enum CodingKeys: String, CodingKey {
        case code = "code"
        case msg = "msg"
        case data = "data"
    }
}

struct LoginInfo: Codable {
    let userID: String
    let username: String
    enum CodingKeys: String, CodingKey {
        case userID = "userID"
        case username = "username"
    }
}