如何从ParentViewController中退出formSheet Modal？

Question

I'm making a modal view that presents when the user touch up on a button. At the moment, I already show the modal and I can use that modal interface.

Now I wan't to dismiss the modal when a button inside the modal is pressed and after that do a segue from it's parent to another view.

let summary = SummaryViewController(nibName: "SummaryViewController", bundle: nil)
summary.preferredContentSize = CGSize(width: 800, height: 300)
summary.modalPresentationStyle = UIModalPresentationStyle.formSheet
self.present(summary, animated: true, completion: nil)

SummaryViewController have the following code:

import UIKit

class SummaryViewController: UIViewController, UITextViewDelegate {

  @IBOutlet weak var summaryTV: UITextView!

  override func viewDidLoad() {
    super.viewDidLoad()
    summaryTV.delegate = self
    summaryTV.textColor = UIColor.lightGray
    summaryTV.text = "Escriba el resumen de la visita"
  }

  override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
  }


  func textViewDidBeginEditing(_ textView: UITextView) {
    if textView.textColor ==  UIColor.lightGray {
      textView.text = nil
      textView.textColor = UIColor.black
    }
  }
  func textViewDidEndEditing(_ textView: UITextView) {
    if textView.text.isEmpty {
      textView.textColor = UIColor.lightGray
      textView.text = "Escriba el resumen de la visita"
    }
  }

  @IBAction func saveSummary(_ sender: Any) {
    print("SummaryTV: \(summaryTV.text)")
  }

  // MARK: Segues
  // Overrided functions for segues. Ordered according to segue flow.
  override func shouldPerformSegue(withIdentifier identifier: String, sender: Any?) -> Bool {
    // If false, segue cancelled. Segue identifier is a parameter of the function.
    // If you use function 'performSegue()' flow do not pass this function.
    if !Reachability.isConnectedToNetwork() {
      CommonAlerts.inetAlert(vc: self)
      return false
    }
    return true
  }
  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

  }
}

So when the user press the button inside the modal view, the IBAction saveSummary is triggered. In that moment I want the parent view controller who present the modal to capture the text on the modal and dismiss the modal. How can I do it?

Answer 1

@IBAction func saveSummary(_ sender: Any) {
    print("SummaryTV: \(summaryTV.text)")

    self.presentingViewController.dismissViewControllerAnimated(false,
          completion: nil)
  }

As for communication, you can setup a weak delegate to presenting VC which will implement a protocol:

protocol SummaryResult {
   func saveResult(summary: String)
}