func signIn(createdUsernameValue: String, passwordValue: String){
 // Signin the user
    let authDetails = AWSCognitoIdentityPasswordAuthenticationDetails(username: createdUsernameValue, password: passwordValue)
    self?.passwordAuthenticationCompletion?.set(result: authDetails)
    self?.user       = self?.pool?.currentUser()

    print("self.user :\(self?.user)" )

    if (self.user == nil) {
            self.user = self.pool?.currentUser()
        }
    refresh()
}


func refresh() {
    self.user?.getDetails().continueOnSuccessWith { (task) -> AnyObject? in
        DispatchQueue.main.async(execute: {
            if(task.error == nil){
                print("user is logged in")
                self.response = task.result
                if let response = self.response  {
                    let attributes = response.userAttributes

                    guard let userId                 = attributes![0].value as? String else { return }
                    guard let phoneNumberVerified    = attributes![1].value as? String else { return }
                    guard let phoneNumber            = attributes![2].value as? String else { return }

                    print("userId: \(userId)")
                }

            } else{
                print("There is an error in the signin process")
                print("Error: \(task.error)")
            }
    })

        return nil
    }
}