Tengo un UIViewController llamado AController. Este despliega un segundo UIViewController llamado BController, pero lo hace en formato modal – overCurrentContext.

BController tiene 3 botones, cada uno lleva a un UIViewController distinto, cada uno de estos 3 UIViewController tiene un UINavigationViewController.

El problema que tengo es que no se como hacer para acceder desde BController a los otros UIViewController sin perder la navegación ni el TopBarLayout.

Mi código es este:

AController

Alamofire.request(urlString, method: .post, parameters: parametros).responseJSON { response in     if let result = response.data {         do {             let json = try JSON(data: result)             if json["resultado"] == "true" {                 let modalViewController = BController()                 modalViewController.modalPresentationStyle = .overCurrentContext                 self.present(modalViewController, animated: true, completion: nil)             }             else {                 self.mostrarAlerta(titulo: "Error", mensaje: "")             }         }         catch {             print("Error: \(error)")             self.mostrarAlerta(titulo: "Error", mensaje: "")         }     } } 

BController

import UIKit  class BController: UIViewController {      var viewPrincipal = UIView()      var btnAccion1 = UIButton()     var btnAccion2 = UIButton()     var btnAccion3 = UIButton()      override func viewDidLoad() {         super.viewDidLoad()          let tamPantalla = UIScreen.main.bounds.size         let width = tamPantalla.width         let height = tamPantalla.height          viewPrincipal = UIView(frame: CGRect(x: 25, y: 90, width: width - 50, height: height - 120))         viewPrincipal.backgroundColor = UIColor.white         viewPrincipal.layer.borderColor = UIColor.black.cgColor         viewPrincipal.layer.borderWidth = 2           btnAccion1 = UIButton(frame: CGRect(x: 0, y: 0, width: width - 100, height: 50))         btnAccion1.setTitle("Accion 1", for: .normal)         btnAccion1.addTarget(self, action: #selector(accion1(_:)), for: .touchUpInside)          btnAccion2 = UIButton(frame: CGRect(x: 0, y: 0, width: width - 100, height: 50))         btnAccion2.setTitle("Accion 2", for: .normal)         btnAccion2.addTarget(self, action: #selector(accion2(_:)), for: .touchUpInside)          btnAccion3 = UIButton(frame: CGRect(x: 0, y: 0, width: width - 100, height: 50))         btnAccion3.setTitle("Accion 3", for: .normal)         btnAccion3.addTarget(self, action: #selector(accion3(_:)), for: .touchUpInside)           viewPrincipal.addSubview(btnAccion1)         viewPrincipal.addSubview(btnAccion2)         viewPrincipal.addSubview(btnAccion3)           view.addSubview(viewPrincipal)     }      override func didReceiveMemoryWarning() {         super.didReceiveMemoryWarning()     }      @objc func accion1(_ sender: UIButton) {         if let viewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "Controller1") as? Controller1 {              if let navigator = navigationController {                 navigator.pushViewController(viewController, animated: true)             }             else {                 print("Error 2")                 if let vc = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "NavegacionController1") as? NavegacionController1 {                     present(vc, animated: true, completion: nil)                 }             }         }         else {             print("Error 1")         }     }      @objc func accion2(_ sender: UIButton) {     }      @objc func accion3(_ sender: UIButton) {     }      @objc func cerrarVentana(_ sender: UIButton) {         print("Cerrar ventana")         self.dismiss(animated: true, completion: nil)         self.presentedViewController?.dismiss(animated: true, completion: nil)     } }