Question

我将一些数据作为json发布到服务器并从中获取json响应..像这样：

             let decoded4  = userDefaults.object(forKey: "nationalities") as! Data
        let decodedNationalities = NSKeyedUnarchiver.unarchiveObject(with: decoded4) as! [Nationality]
        for nationality in decodedNationalities {
            if nationality.name == self.nationality {
                idnationality = nationality.id
            }

        }
        if conttype == "Single visit"{
            conttype = "single_visit"
        }else {
            conttype = "multi_visit"
        }
        print(days)
        if days.hasPrefix(","){
            days.remove(at: days.startIndex)
        }
        if days.hasSuffix(","){
            days.remove(at: days.endIndex)
        }
        let todosEndpoint: String = "my link"
        guard let todosURL = URL(string: todosEndpoint) else {
            print("Error: cannot create URL")
            return
        }
        var todosUrlRequest = URLRequest(url: todosURL)
        todosUrlRequest.httpMethod = "POST"
        todosUrlRequest.addValue("application/json", forHTTPHeaderField: "Content-Type")
        let newTodo: [String: Any] = ["email": UserDefaults.standard.string(forKey: "CustomerEmail")!, "password": UserDefaults.standard.string(forKey: "CustomerPassword")!, "id_address": addid, "quantity_staff": maidn, "id_service": idservice, "id_region": idregion, "id_city": idcity, "id_nationality": idnationality, "start_date": "2018-05-09",  "contract_type": "single_visit", "shift_type": "day", "weekdays": days, "starttime": starttime, "endtime": endtime]
        print(newTodo)
        let jsonTodo: Data
        do {
            jsonTodo = try JSONSerialization.data(withJSONObject: newTodo, options: [])
            todosUrlRequest.httpBody = jsonTodo
        } catch {
            print("Error: cannot create JSON from todo")
            return
        }

        let session = URLSession.shared

        let task = session.dataTask(with: todosUrlRequest) {
            (data, response, error) in
            guard error == nil else {
                print("error calling POST on /public/api/register_customer")
                print(error!)
                return
            }
            guard let responseData = data else {
                print("Error: did not receive data")
                return
            }

            // parse the result as JSON, since that's what the API provides
            do {
                guard let receivedTodo = try JSONSerialization.jsonObject(with: responseData,options: []) as? [String: Any] else {
                    print("Could not get JSON from responseData as dictionary")
                    return
                }
                print("The todo is: " + receivedTodo.description)

                guard let status = receivedTodo["success"] as? Int else {
                    print("Could not get status from JSON")
                    return
                }

                if status == 0{
                    DispatchQueue.main.async {
                        self.performSegue(withIdentifier: "segueerr", sender: self)
                    }

                    print("The status is: 0")
                    guard let messages = receivedTodo["message"] as? String else {
                        print("Could not get messages from JSON")
                        return
                    }
                    print(messages)


                }
                else {
                    DispatchQueue.main.async {
                        self.performSegue(withIdentifier: "successsegue", sender: self)
                    }
                    print("Success!")
                }
            } catch  {
                print(error)
                return
            }
        }
        task.resume()


    }

当我运行它时...它发布了正确的值：

[“email”：“lamatat@gmail.com”，“id_service”：3，“id_region”：1， “id_city”：3，“id_address”：22，“weekdays”：“tue”，“contract_type”： “single_visit”，“id_nationality”：4，“密码”： “4169faf51ce3c5fb8850451b441a363906f16d69”，“endtime”：12， “starttime”：8，“shift_type”：“day”，“quantity_staff”：1， “start_date”：“2018-05-09”]

我收到错误的答案是：

错误域= NSCocoaErrorDomain代码= 3840“没有值。” UserInfo = {NSDebugDescription =无值。}

当确定100％的值并且在邮递员中尝试了同样的一个并且得到了这个结果：

   {
"success": true,
"message": "Adding new Order was successful.",
"id_order": 210,
"shift": {
    "id": 31,
    "id_region": 1,
    "id_city": 3,
    "id_nationality": 4,
    "id_service": 3,
    "shift_date": "2018-05-09 00:00:00",
    "shift_type": "day",
    "weekday": "tue",
    "quantity_staff": 64,
    "lead_hours": 10,
    "created_at": "2018-05-07 12:54:48",
    "updated_at": "2018-05-09 10:47:37",
    "deleted_at": null,
    "price_per_visit": 50
}
}

为什么我会从应用程序中收到此错误？！

有人请帮忙！我不知道什么是错的！

Answer 1

试试这个而不是你的。将其更改为

jsonTodo = try JSONSerialization.data(withJSONObject: newTodo, options: [])

以

let jsonTodo = JSONStringify(value: newTodo as AnyObject)

在控制器中添加此方法

func JSONStringify(value: AnyObject,prettyPrinted:Bool = false) -> String{ let options = prettyPrinted ? JSONSerialization.WritingOptions.prettyPrinted : JSONSerialization.WritingOptions(rawValue: 0) if JSONSerialization.isValidJSONObject(value) { do{ let data = try JSONSerialization.data(withJSONObject: value, options: options) if let string = NSString(data: data, encoding: String.Encoding.utf8.rawValue) { return string as String } }catch { print("error") //Access error here } } return "" }

*但如果您仍面临同样的问题。改变你的httoBody也像这样

request.httpBody = jsonTodo.data(using: String.Encoding.utf8)

尝试将json发布到服务器时出错Code = 3840

1 个答案: