Вручную соедините розетку с кнопкой с помощью кода

Question

Мне удалось закодировать четыре элемента UIBarButton, которые появляются при запуске моего приложения.Однако, когда я нажимаю одну из кнопок (чтобы перейти на новый экран), приложение вылетает с ошибкой SIGBART.Из предыдущего опыта я знаю, что это может быть вызвано отсутствием подключения к розеткам.Но поскольку я кодировал кнопки, которые должны отображаться в моем файле, я не уверен, как подключить розетку и действия с помощью кода.Любое руководство будет высоко ценится!

    import UIKit

    class navigationToolBar: UINavigationController, UIToolbarDelegate {

        @IBOutlet weak var searchBarButton1: UIBarButtonItem!


        override func viewDidLoad() {
            super.viewDidLoad()
            print(UIApplication.shared.statusBarFrame.height)//44 for iPhone x, 20 for other iPhones
            navigationController?.navigationBar.barTintColor = .blue
            self.toolbar.barTintColor = UIColor.black

            var searchicon = UIImage(named: "searchicon")!
            var protocolsicon = UIImage(named: "protocolsicon")!
            var homeicon = UIImage(named: "homeicon")!
            var toolsicon = UIImage(named: "toolsicon")!


            let search1 = self.storyboard?.instantiateViewController(withIdentifier: "searchn") as! UINavigationController
            let protocols1 = self.storyboard?.instantiateViewController(withIdentifier: "protocolsn") as! UINavigationController
            let home1 = self.storyboard?.instantiateViewController(withIdentifier: "homen") as! UINavigationController
         //   let tools1 = self.storyboard?.instantiateInitialViewController(withIdentifier: "initial") as! imageViewController
          //  let info1 = self.storyboard?.instantiateViewController(withIdentifier: "Information") as! imageViewController

            let toolBar = UIToolbar()
            var items = [UIBarButtonItem]()


            var searchBarButton1 = UIBarButtonItem(image: searchicon, style: .plain, target: self, action: Selector(("opensearchbar1")))



            items.append(
                UIBarButtonItem(image: searchicon, style: .plain, target: self, action: Selector(("opensearchbar1")))
            )
            items.append(
                UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
            )
            items.append(
                UIBarButtonItem(image: protocolsicon, style: .plain, target: self, action: Selector(("opensearchbar")))
            )
            items.append(
                UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
            )
            items.append(
                UIBarButtonItem(image: homeicon, style: .plain, target: self, action: Selector(("onClickBarButton:")))
            )
            items.append(
                UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
            )
            items.append(
                UIBarButtonItem(image: toolsicon, style: .plain, target: self, action: Selector(("onClickBarButton:")))
            )
            items.append(
                UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
            )
            items.append(
                UIBarButtonItem(image: toolsicon, style: .plain, target: self, action: Selector(("onClickBarButton:")))
            )


            func opensearchbar(_ sender: UIBarButtonItem) {

                switch sender.tag {
                case 1:
                    print("1")
                    break;
               case 2:
                    print("error")
                    break;
                case 3:
                    self.navigationController?.pushViewController(protocols1, animated: true)
                    break;
                case 4:
                    print("error")
                    break;
                case 5:
                    self.navigationController?.pushViewController(home1, animated: true)
                    break;
                case 6:
                    print("error")
                    break;
                case 7:
                    self.navigationController?.pushViewController(home1, animated: true)
                    break;
                case 8:
                    print("error")
                    break;
              //  case 9:
              //      self.navigationController?.pushViewController(info1, animated: true)
              //      break;
                default:
                  print("ERROR!!")
                }
            }



            toolBar.setItems(items, animated: true)
            toolBar.tintColor = .blue
            toolbar.barStyle = UIBarStyle.default
            toolBar.isTranslucent = true
            view.addSubview(toolBar)

            toolBar.translatesAutoresizingMaskIntoConstraints = false


            if #available(iOS 11.0, *) {
                let guide = self.view.safeAreaLayoutGuide
                toolBar.trailingAnchor.constraint(equalTo: guide.trailingAnchor).isActive = true
                toolBar.leadingAnchor.constraint(equalTo: guide.leadingAnchor).isActive = true
                toolBar.bottomAnchor.constraint(equalTo: guide.bottomAnchor).isActive = true
                toolBar.heightAnchor.constraint(equalToConstant: 44).isActive = true

            }
            else {
                NSLayoutConstraint(item: toolBar, attribute: .bottom, relatedBy: .equal, toItem: view, attribute: .bottom, multiplier: 1.0, constant: 0).isActive = true
                NSLayoutConstraint(item: toolBar, attribute: .leading, relatedBy: .equal, toItem: view, attribute: .leading, multiplier: 1.0, constant: 0).isActive = true
                NSLayoutConstraint(item: toolBar, attribute: .trailing, relatedBy: .equal, toItem: view, attribute: .trailing, multiplier: 1.0, constant: 0).isActive = true

                toolBar.heightAnchor.constraint(equalToConstant: 44).isActive = true
            }

    }

func opensearchbar1 (_ sender: UIBarButtonItem) {
let search1 = self.storyboard?.instantiateViewController(withIdentifier: "searchn") as! ViewController
self.navigationController?.pushViewController(search1, animated: true)

    }
}