By assigning property Passing data forward

class FirstViewController: UIViewController {

    func openSecondViewController() {

        // Here we initialize SecondViewController and set the id property to 492
        let secondViewController = SecondViewController()
        secondViewController.id = 492

        // Once it was assign we now push or present the view controller
        present(secondViewController, animated: true, completion: nil)
    }

}

class SecondViewController: UIViewController {
    
    var id: Int?

    override func viewDidLoad() {
        super.viewDidLoad()

        // Here we unwrapped the id and will get the data from the previous view controller.
        if let id = id {
            print("Id was set: \(id)")
        }
    }
}