Data Sharing Between My App and App Extensions

Question

I transfer data from the sharing extension to my main application with UserDefaults and open the application (goToApp()) after hitting the "post" button. However, the view of my app is not redrawn and the text remains the same "Share Extension Example". Here's how I'm trying to do it:

class ShareViewController: SLComposeServiceViewController {
    private var textString: String?
    
    override func isContentValid() -> Bool {
      if let currentMessage = contentText {
          self.textString = currentMessage
      }
      return true
    }
    
    override func viewDidLoad() {
        super.viewDidLoad()

      }

    override func didSelectPost() {
        UserDefaults.standard.set(self.textString!, forKey: "text")
        gotoApp()
        self.extensionContext!.completeRequest(returningItems: [], completionHandler: nil)
    }
    
    func gotoApp() {
        guard let url = URL(string: "example://") else { return }

        let selectorOpenURL = sel_registerName("openURL:")
        var responder: UIResponder? = self

        while responder != nil {
            if responder?.responds(to: selectorOpenURL) == true {
                responder?.perform(selectorOpenURL, with: url)
            }
            responder = responder?.next
        }
    }
}

And the project to which I am trying to transfer data:

class ViewController: UIViewController {

    private let mainVStack = UIStackView()
    private let backgroundView = UIImageView()
    private let titleLabel = UILabel()

    override func viewDidLoad() {
        super.viewDidLoad()
        configureMainStack()
        configureTitleLabel()
    }
}

// MARK: - UI Elements
private extension ViewController {
    func configureMainStack() {
        mainVStack.distribution = .fillProportionally
        mainVStack.embed(asSubviewTo: view, inset: 40)
    }

    func configureTitleLabel() {
        titleLabel.textAlignment = .center
        titleLabel.textColor = .blue
        if let text = UserDefaults.object(forKey: "text") as? String {
            titleLabel.text = text
        } else {
            titleLabel.text = "Share Extension Example"
        }
        let titleContainerView = UIView()
        titleLabel.embedIn(titleContainerView, hInset: 0, vInset: 100)
        mainVStack.addArrangedSubview(titleContainerView)
    }
}