PushVsModal-1

ViewController.swift

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    @IBAction func pushViewController() {
        let targetViewController = UIViewController.viewControllerFromMainStoryboard(identifier: ViewController.storyboardIdentifier)
        self.navigationController?.pushViewController(targetViewController, animated: true)
    }
}

extension UIViewController {
     static var storyboardIdentifier: String {
         return String(describing: self)
     }
     
     static func viewControllerFromMainStoryboard(identifier: String) -> UIViewController {
         return viewController(storyboardName: "Main", identifiler: identifier)
     }
     
     static func viewController(storyboardName: String, identifiler: String) -> UIViewController {
         let storyboard = UIStoryboard(name: storyboardName, bundle: nil)
         if #available(iOS 13.0, *) {
             return storyboard.instantiateViewController(identifier: identifiler)
         } else {
             return storyboard.instantiateViewController(withIdentifier: identifiler)
         }
     }
}