ios - 使用 Alamofire 解析 Codable 响应

Question

我使用的是 Alamofire 框架，但我不明白为什么下面的变量是空的。

json:

{
    "ret": true,
    "text": "Oke!",
    "data": {
        "email": “test@mail.com”,
        "nev": "text",
        "zip": "1234",
        "city": "London",
        "street": "text",
        "phone": "5555555555",
        "gdpr": "2"
    }
}

用户数据根类.swift:

struct UserDataRootClass : Codable {

        let data : UserDataData?
        let ret : Bool?
        let text : String?

        enum CodingKeys: String, CodingKey {
                case data = "data"
                case ret = "ret"
                case text = "text"
        }

        init(from decoder: Decoder) throws {
                let values = try decoder.container(keyedBy: CodingKeys.self)
                data = try? UserDataData(from: decoder)
                ret = try values.decodeIfPresent(Bool.self, forKey: .ret)
                text = try values.decodeIfPresent(String.self, forKey: .text)
        }

}

用户数据数据.swift:

struct UserDataData : Codable {

        let city : String?
        let email : String?
        let gdpr : String?
        let nev : String?
        let phone : String?
        let street : String?
        let zip : String?

        enum CodingKeys: String, CodingKey {
                case city = "city"
                case email = "email"
                case gdpr = "gdpr"
                case nev = "nev"
                case phone = "phone"
                case street = "street"
                case zip = "zip"
        }

        init(from decoder: Decoder) throws {
                let values = try decoder.container(keyedBy: CodingKeys.self)
                city = try values.decodeIfPresent(String.self, forKey: .city)
                email = try values.decodeIfPresent(String.self, forKey: .email)
                gdpr = try values.decodeIfPresent(String.self, forKey: .gdpr)
                nev = try values.decodeIfPresent(String.self, forKey: .nev)
                phone = try values.decodeIfPresent(String.self, forKey: .phone)
                street = try values.decodeIfPresent(String.self, forKey: .street)
                zip = try values.decodeIfPresent(String.self, forKey: .zip)
        }

}

网络管理器.swift:

func postLogin(urlString: String, completion: @escaping (UserDataRootClass?) -> Void) {
        Alamofire.request(urlString).response {
            response in
            guard let data = response.data else { return }
            do {
                let decoder = JSONDecoder()
                let loginRequest = try decoder.decode(UserDataRootClass.self, from: data)
               completion(loginRequest)
            } catch let error {
                print(error)
                completion(nil)
            }
        }
    }

登录 View Controller .swift:

let networkManager = NetworkManager()
networkManager.postLogin(urlString: "http://demo.com") { (loginRequest) in

if((loginRequest?.ret)!) {
   print(loginRequest) // -> for log
   print(loginRequest?.data.phone)
   }

}

日志:

UserDataRootClass(data: Optional(.UserDataData(gdpr: nil, email: nil, zip: nil, nev: nil, phone: nil, city: nil, street: nil)), ret: Optional(true), text: Optional("Oke!"))

loginRequest?.ret 和 loginRequest?.text 很好，但是 loginRequest?.data.email, loginRequest ?.data.zip... 为空 (nil)

Answer 1

当类型的变量名称与api 响应中的 json 键。例如，在您的情况下，您已将所有变量(在 UserDataRootClass 和 UserDataData 内)命名为与其各自的 json 键相同，因此您可以删除这些枚举.

struct UserDataData : Codable {

        let city : String?
        let email : String?
        let gdpr : String?
        let nev : String?
        let phone : String?
        let street : String?
        let zip : String?
}

struct UserDataRootClass : Codable {

        let data : UserDataData?
        let ret : Bool?
        let text : String?
}

此外，您不需要实现 init(from decoder: Decoder) throws { 直到您必须对任何属性进行一些自定义。