How to get value and id_value for PushRow in Swift4

I use xCode 9, swift 4 and "Eureka form library" for my project.

**The situation**

I have a list of cars with name and unique ID associated this way: 0 - ANY, 1 - VW, 7 - AUDI, 20 - MAZDA

var name_cars: [String] = ["ANY","VW","AUDI","MAZDA"]

var id_cars:[Int] = [0, 1, 7, 20]

I also have a form with "PushRow" and "ButtonRow".

On click to the button I want to print the selected car name and ID.

I was able to print the car's name but not the ID.

import UIKit

import Eureka

class myPage: FormViewController {

var cars: [String] = ["ANY","VW","AUDI","MAZDA"]

var id_cars:[Int] = [0, 1,7,20]

var selected_car: String = "ANY" //default car

var selected_car_id: Int = 0 //default id car

override func viewDidLoad() {

super.viewDidLoad()

create_form()

}

func create_form(){

form

+++ Section("List")

//list

<<< PushRow<String>() {

$0.title = "Cars"

$0.options = cars

$0.value = "ANY"

$0.tag = "list_element"

$0.selectorTitle = "Choose car"

$0.onChange { [unowned self] row in

self.selected_car = row.value!

self.selected_car_id = ??? // **what should it be here in order to get the ID**

}

}

//button

<<< ButtonRow("Button1") {row in

row.title = "Get Value on Console"

row.onCellSelection{[unowned self] ButtonCellOf, row in

print ("Car selected = ",self.selected_car, " and Id_Car_Selected = ",self.selected_car_id)

}

}

}

}