Getting Urlsessiontask failed with error: the request timed out with blank screen RxSwift in swift

Question

I am using RxSwift in swift. When my server is close it shows below error with blank screen. I have used a alert. But I have to click too many time to close the alert here is the error

I have implemented RxSwift below like

Data Model

  struct LoginDto : Decodable {

    let outCode: String
    let outMessage: String

    enum CodingKeys: String, CodingKey {
        case outCode = "outCode"
        case outMessage = "outMessage"

    init(from decoder: Decoder) throws {
        let values = try decoder.container(keyedBy: CodingKeys.self)
        outCode = try values.decodeIfPresent(String.self, forKey: .outCode) ?? ""
        outMessage = try values.decodeIfPresent(String.self, forKey: .outMessage) ?? ""

    }
}

Common Error handling

 import RxSwift
 import Alamofire
  class ErrorViewModel {
    static let shared = ErrorViewModel()
    let publishSubject = PublishSubject<ErrorResponse>()
    var errorResponse: Observable<ErrorResponse> {
        return publishSubject.asObservable()
    }

   // private init() {}
}

View Model

import RxSwift
import Alamofire
class LoginViewModelV{

private let loginSubject = PublishSubject<LoginDto>()
var LoginResponse: Observable<LoginDto> {
    return loginSubject.asObservable()
}

 func doLogin(`var` parameters: [String: Any]) {

        AF.request("htt://myurl/login", method: .post, parameters:parameters,
                   encoding: JSONEncoding.default,
                   headers: "myheader")

            .validate(statusCode: 200..<500)
            .responseDecodable(of: LoginDto.self) { [weak self] response in

                switch response.result {
                case .success:
                    switch response.response!.statusCode {
                    case 200:
                        if let v_response = response.value {
                              self?.loginSubject.onNext(v_response)
                        }
                    default:
                        let ex =  ErrorHandling.exception(statusCode:response.response?.statusCode)
                        ErrorViewModel.shared.publishSubject.onNext(ex)
                    }
                case .failure(let error):
                    let ex =  ErrorHandling.exception(error: error,statusCode:response.response?.statusCode)
                    ErrorViewModel.shared.publishSubject.onNext(ex)

                }

            }
    }
}

Here ViewController

 import UIKit
 import RxSwift
 class LoginViewController: UIViewController {

var loginViewModel = LoginViewModelV()    
private let disposeBag = DisposeBag()

override func viewDidLoad() {
    super.viewDidLoad()
    doLogin()
    observeEvents()
}

func observeEvents(){
    self.loginViewModel.LoginResponse
        .subscribe(onNext: { response in
            // here is login

        })
        .disposed(by: self.disposeBag)

    ErrorViewModel.shared.publishSubject.subscribe(onNext: { err in
        Custom_Progress_bar.hide()
        /***
         I have use here sweet alert
         */
     //   Custom_Sweet_alert.show_error_message(messsage: err.message)

    }).disposed(by: self.disposeBag)
}

func doLogin(){

    let parameters: [String: Any] = [
        "userId": "myuserId",
        "passowrd": "mypasswor"
    ]

    loginViewModel.doLogin(var:parameters)
 }

}

when server is off, observeEvents method LoginViewController in alert shows with blank screen. I have use ErrorViewModel to get all common error like network or others. What is the wrong of my code? Please help to solve the problem...

score 0 · Answer 1 · answered Mar 24 '23 at 12:07

The likely problem here is that your ErrorViewModel.publishSubject is emitting more than once. You will have to track that down.

But in general, you are working way too hard here. Let's simplify your code by using my Cause_Logic_Effect library. You can import the library through Cocoapods or SPM.

import Cause_Logic_Effect
import RxSwift
import UIKit

struct LoginDto: Decodable {
    let outCode: String
    let outMessage: String
}

class LoginViewModelVI {
    static func doLogin(parameters: [String: Any]) -> Observable<LoginDto> {
        Observable.create { observer in
            AF.request("htt://myurl/login", method: .post, parameters:parameters, encoding: JSONEncoding.default, headers: "myheader")
                .validate(statusCode: 200..<500)
                .responseDecodable(of: LoginDto.self) { response in
                    switch response.result {
                    case .success:
                        if let value = response.value, response.response!.statusCode == 200 {
                            observer.onSuccess(value)
                        } else {
                            observer.onError(ErrorHandling.exception(statusCode:response.response?.statusCode))
                        }
                    case .failure(let error):
                        observer.onError(ErrorHandling.exception(error: error,statusCode:response.response?.statusCode))
                    }
                }
            return Disposables.create()
        }
    }
}

class LoginViewController: UIViewController {
    let userIdField = UITextField()
    let passwordField = UITextField()
    let loginButton = UIButton()
    let activityTracker = ActivityTracker()
    let errorRouter = ErrorRouter()
    private let disposeBag = DisposeBag()

    override func viewDidLoad() {
        super.viewDidLoad()
        bind()
    }

    func bind() {
        loginButton.rx.tap
            .withLatestFrom(Observable.combineLatest(userIdField.rx.text, passwordField.rx.text))
            .flatMapFirst { [activityTracker, errorRouter] userId, password in
                LoginViewModelVI.doLogin(parameters: [
                    "userId": "myuserId",
                    "passowrd": "mypasswor"
                ])
                .trackActivity(activityTracker)
                .rerouteError(errorRouter)
            }
            .subscribe(onNext: { response in
                // here is login
            })
            .disposed(by: disposeBag)

        errorRouter.error
            .subscribe(onNext: { err in
                /***
                 I have use here sweet alert
                 */
                //Custom_Sweet_alert.show_error_message(messsage: err.message)
            })
            .disposed(by: self.disposeBag)

        activityTracker.isActive
            .subscribe(onNext: { isActive in
                if isActive {
                    Custom_Progress_bar.show()
                } else {
                    Custom_Progress_bar.hide()
                }
            })
            .disposed(by: self.disposeBag)
    }
}

Getting Urlsessiontask failed with error: the request timed out with blank screen RxSwift in swift

1 Answers1