Xcode – Swift – Pass data from Child View to Parent View

I want to pass my data from child view controller to parent view controller.

I’m just moving the child view to the top of the parent view, here is my code:

let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let toChildView = storyBoard.instantiateViewController(identifier: "toChildView")
                        
// show child view
self.addChild(toChildView)
toChildView.willMove(toParent: self)
toChildView.view.frame = self.view.bounds
self.view.addSubview(toChildView.view)
toChildView.didMove(toParent: self)

Here is the delegate:

protocol DataDelegate {
    func printTextField(string: String)
}

I added variable delegate to my Child View

var delegate: DataDelegate?

And send the data to Parent View

@IBAction func btnSend(_ sender: Any) {
    delegate?.printTextField(string: textField.text)
}

And close the Child View, like:

@IBAction func btnClose(_ sender: Any) {
    // back to parent view
    self.willMove(toParent: nil)
    self.view.removeFromSuperview()
    self.removeFromParent()
}

Calling the DataDelegate to Parent View

class ParentView: UIViewController, DataDelegate {
    func printTextField(string: String) {
        print(string)
    }
}

Im planning to pass the data of my text field from child view to parent view, I try this codes:
https://jamesrochabrun.medium.com/implementing-delegates-in-swift-step-by-step-d3211cbac3ef
https://www.youtube.com/watch?v=aAmvQU9HccA&t=438s

but it didn’t work, any help thanks 🙂

EDITED: Added my delegate implementation code…