JSON错误：NSInvalidArgumentException原因Swift3 iOS中JSON写入中的顶级类型无效

我在尝试将数据发布到服务器时遇到此异常：

由于未捕获异常“NSInvalidArgumentException”而终止应用程序，原因：“***+[NSJSONSerialization dataWithJSONObject:options:error:：JSON中的顶级类型无效 写

这是我的实体类：

class RequestModel {

    var CompanyId: Int? = 0
    var RollupYear: Int? = 0
    var UserId: Int? = 0

    var dataRollupArr:[DataRollupModel]?
    var seasonalityArr:[SeasonalityModel]?
}

class DataRollupModel {

    var Name: String? = ""
    var CurrentValue: Float? = 0.0
    var RollupYear: Int? = 0
    var DataRollupColumnID: Int? = 0
}

class SeasonalityModel {

    var CompanyPeriodId: Int? = 0
    var UserId: Int? = 0
    var Seasonality: String? = ""
}

此处设置值和服务器方法：

func createJSONFromMadal(){

        let resqM = RequestModel()
        resqM.dataRollupArr = [DataRollupModel]()
        resqM.seasonalityArr = [SeasonalityModel]()

        let rollupYear = Int(self.lblYear.text!)
        let userId = UserDefaults.standard.value(forKey: "userid") ?? 0
        let companyId = UserDefaults.standard.value(forKey: "companyid") ?? 0

        resqM.CompanyId = companyId as? Int
        resqM.RollupYear = rollupYear
        resqM.UserId = userId as? Int

        //For DataRollupModel
        for i in 0..<self.responseModel.dataRollupValuesArray.count {

        let dataRollup = responseModel.dataRollupValuesArray[i] as! DataRollupValuesModel

        let r1 = DataRollupModel()

        r1.Name = dataRollup.name
        r1.CurrentValue = dataRollup.currentValue
        r1.RollupYear = rollupYear

        resqM.dataRollupArr?.append(r1)
        }


        //For SeasonalityModel
        for i in 0..<self.responseModel.seasonalityDataResponseArray.count {

            let seasonalityData = responseModel.seasonalityDataResponseArray[i] as! SeasonalityDataResponseModel

            let s1 = SeasonalityModel()
            s1.CompanyPeriodId = seasonalityData.id
            s1.UserId = userId as? Int
            s1.Seasonality = seasonalityData.seasonality

            resqM.seasonalityArr?.append(s1)
        }

        //server code
        do {

            HUDIndicatorView.shared.showHUD(view: self.view,
                                            title: "Loading ..")

            DispatchQueue.global(qos: .userInitiated).async {

                let servicemodel = ServiceModel()

                servicemodel.saveGoal(requestModel: resqM) { returnstring in
                    print(returnstring)

                    DispatchQueue.main.async {

                        HUDIndicatorView.shared.dismissHUD()


                    }
                }
            }

        } catch {

            handleError(error: error)
        }

    }

我必须以如下格式传递JSON请求：

{
    "CompanyId": 162,
    "RollupYear": 2018,
    "UserId": 1609,
    "datarollup": [{
            "Name": "My Cards",
            "RollupYear": 2018,
            "DataRollupColumnID": 210,
            "CurrentValue": 520
        },
        {
            "Name": "Pros calls",
            "RollupYear": 2018,
            "DataRollupColumnID": 212,
            "CurrentValue": 1300
        }
    ],
    "Seasonalitylist": [{
            "CompanyPeriodId": 386,
            "UserId": 1609,
            "Seasonality": 25
        },
        {
            "CompanyPeriodId": 387,
            "UserId": 1609,
            "Seasonality": 25
        }
    ]
}

请帮助我如何在我的代码中添加数组标题

“datarollup”

和

“季节性列表”

？ 有人能建议我如何解决这个错误吗

---

谢谢大家!

创建可编码的类，如下所示

class RequestModel : Encodable {
    var CompanyId: Int? = 0
    var RollupYear: Int? = 0
    var UserId: Int? = 0
}

现在您可以通过以下方式创建相同的

JSON字符串

：

let myStruct = RequestModel()
myStruct.CompanyId = 5
myStruct.RollupYear = 2018
myStruct.UserId = 108

let encoder = JSONEncoder()
encoder.outputFormatting = .prettyPrinted
let data = try! encoder.encode(myStruct)
print(String(data: data, encoding: .utf8)!)

产量将低于

{
  "UserId" : 108,
  "CompanyId" : 5,
  "RollupYear" : 2018
}

希望这对你有帮助

供参考。这只是你的参考。请根据您的要求更新完整的班级结构

更新

像这样使用图书馆

class RequestModel {
    var CompanyId: Int? = 0
    var RollupYear: Int? = 0
    var UserId: Int? = 0
    var dataRollupArr = [DataRollupModel]()
}

class DataRollupModel {
    var Name: String? = ""
    var CurrentValue: Float? = 0.0
    var RollupYear: Int? = 0
    var DataRollupColumnID: Int? = 0
}

我在下面实现了

let myStruct = RequestModel()
myStruct.CompanyId = 5
myStruct.RollupYear = 2018
myStruct.UserId = 108

for i in 0...2 {
    let rollUpModel = DataRollupModel()
    rollUpModel.Name = "Test \(i)"
    rollUpModel.CurrentValue = 25.5
    rollUpModel.DataRollupColumnID = 5
    rollUpModel.RollupYear = 2015
    myStruct.dataRollupArr.append(rollUpModel)
}

let json = JSONSerializer.toJson(myStruct)
print(json)

输出将是这样的

{"CompanyId": 5, "RollupYear": 2018, "UserId": 108, "dataRollupArr": [{"Name": "Test 0", "CurrentValue": 25.5, "RollupYear": 2015, "DataRollupColumnID": 5}, {"Name": "Test 1", "CurrentValue": 25.5, "RollupYear": 2015, "DataRollupColumnID": 5}, {"Name": "Test 2", "CurrentValue": 25.5, "RollupYear": 2015, "DataRollupColumnID": 5}]}

输出将如下所示

class RequestModel {
    var CompanyId: Int? = 0
    var RollupYear: Int? = 0
    var UserId: Int? = 0
    var dataRollupArr = [DataRollupModel]()
}

class DataRollupModel {
    var Name: String? = ""
    var CurrentValue: Float? = 0.0
    var RollupYear: Int? = 0
    var DataRollupColumnID: Int? = 0
}

---

感谢您的回复@PPL，在我的JSON中，我还需要发送两个对象数组。我不知道如何添加数组标题？让我在代码中尝试一下，非常感谢。我会很快让你知道。请接受并投票它对你有用。这可能有助于其他人我也像上面@PPL那样做了，我也得到了我的JSON，但当我将此发布到我的后端服务器应用程序时，它正在崩溃“由于未捕获的异常“NSInvalidArgumentException”终止应用程序，原因：“***+[NSJSONSerialization dataWithJSONObject:选项：错误：：：JSON写入中的顶级类型无效”在这行中：让jsonData=try！数据（使用jsonObject:json，选项：[]）为什么要再次执行NSJSONSerialization？作为JSONSerializer.toJson（myStruct），这将为您提供json字符串