self.signedUp  = signUpButtonTap.withLatestFrom(userAndPassword).flatMapLatest{
            input ->  Observable<Response> in
            return  Observable.create { observer in
                let userData = Creator()
                userData?.username = input.0
                userData?.password = input.1
                provider.request(.signIn(userData!)).filter(statusCode: 200).subscribe{  event -> Void in

                    switch event {
                    case .next(let response):
                        observer.onNext(response)

                    case .error(let error):
                        let moyaError: MoyaError? = error as? MoyaError
                        let response: Response? = moyaError?.response
                        let statusCode: Int? = response?.statusCode
                        observer.onError(error)

                    default:
                        break
                    }

                }
                return Disposables.create()
            }
        }