ios - 如何快速使用 Alamofire 从 API 获取空数据？

Question

关于我的代码，我再次需要一些帮助。有点混淆空 data 将如何从 APIService 反射(reflect)到 ViewController。

这是 JSON

{
 "responseMessage": "No record Found",
 "data": []
}

如您所见，data 为 nil。

这是 APIService

 typealias getDoctorPayoutSummaryTaskCompletion = (_ latestPayoutSummary: DoctorPayoutSummary?, _ error: NetworkError?) -> Void

  static func getDoctorPayoutSummary(doctorNumber: String, periodId: Int, completion: @escaping getDoctorPayoutSummaryTaskCompletion) {

    guard let latestPayoutSummaryURL = URL(string: "\(Endpoint.LatestCreditedAmount.latestPayoutSummary)?periodId=\(periodId)&doctorNumber=\(doctorNumber)") else {
            completion(nil, .invalidURL)
            return
        }

        let sessionManager = Alamofire.SessionManager.default
        sessionManager.session.getAllTasks { (tasks) in
           tasks.forEach({ $0.cancel() })
        }


        Alamofire.request(latestPayoutSummaryURL, method: .get, encoding: JSONEncoding.default).responseJSON { (response) in
            guard HelperMethods.reachability(responseResult: response.result) else {
                completion(nil, .noNetwork)
                return
            }

            guard let statusCode = response.response?.statusCode else {
                completion(nil, .noStatusCode)
                return
            }

            switch(statusCode) {
            case 200:
                guard let jsonData = response.data else {
                    completion(nil, .invalidJSON)
                    return
                }

                let decoder = JSONDecoder()

                do {
                    let currentPayoutSummary = try decoder.decode(RootDoctorPayoutSummary.self, from: jsonData)
                        print(periodId)
                    print(currentPayoutSummary.data ?? "data is nil")
                    print(currentPayoutSummary.data ?? "response is nil")
                    completion(currentPayoutSummary.data, nil)

                } catch {
                    completion(nil, .invalidJSON)
                    print(error)
                }

            case 400: completion(nil, .badRequest)
            case 404: completion(nil, .noRecordFound)
            default:
                print("**UNCAPTURED STATUS CODE FROM (getDoctorPayoutSummary)\nSTATUS CODE: \(statusCode)")
                completion(nil, .uncapturedStatusCode)
            }
        }
    }

我尝试使用断点来跟踪我的代码，如果 APIService 端的 data 为空，它会打印 data is nil 。但不幸的是，如果数据为空，则 ViewController 端的 getDoctorPayoutSummary 函数无法识别。它只是识别 data 是否不为空并且运行顺利。

这是 getDoctorPayoutSummary()

 func getDoctorPayoutSummary(doctorNumber: String) {
    SVProgressHUD.setBackgroundColor(.lightGray)
    SVProgressHUD.show(withStatus: "Processing...")

    APIService.DoctorLatestCreditedAmount.getDoctorPayoutSummary(doctorNumber: doctorNumber, periodId: doctorPayoutWeek[0].periodId!) { (payoutsummary, error) in

        guard let payoutSummaryDetails = payoutsummary, error == nil else {
            if let networkError = error {
                switch networkError {
                case .noRecordFound:
                    self.noRecordView.isHidden = false
                    self.creditedAmountLabel.isHidden = true
                case .noNetwork:
                    let alertController = UIAlertController(title: "No Network", message: "\(networkError.rawValue)", preferredStyle: .alert)

                    alertController.addAction(UIAlertAction(title: "OK", style: .default))
                    self.present(alertController, animated: true, completion: nil)
                default:
                    let alertController = UIAlertController(title: "Error", message: "There is something went wrong. Please try again", preferredStyle: .alert)
                    alertController.addAction(UIAlertAction(title: "OK", style: .default))
                    self.present(alertController, animated: true, completion: nil)
                }
            }

            SVProgressHUD.dismiss()
            return
        }


        self.payoutSummary = payoutSummaryDetails
        print(payoutSummaryDetails)

        if self.payoutSummary == nil {
                    self.noRecordView.isHidden = false
                    SVProgressHUD.dismiss()
                    return
            }

        self.creditedAmountLabel.text = "₱\(self.payoutSummary.creditedAmount ?? 0.0)"
        self.getPatientList()
        self.noRecordView.isHidden = true
        self.week1TableView.reloadData()

        SVProgressHUD.dismiss()
        return
    }

}

如果我问得太多，我深表歉意，但我真的需要帮助来解决这个问题，这样我才能继续执行其他任务。请求你的一点时间来帮助我。太感谢了。

Answer 1

如果数据为空它将返回空数组，所以检查

if currentPayoutSummary.data.isEmpty {
       print("Data is empty !!")
       completion(nil, .noRecordFound)
}

或

 if currentPayoutSummary.data.count == 0 {
           print("Data is empty !!")
           completion(nil, .noRecordFound)
    }