How to hide pop up view on previous page when pressing back button on swift

I have this kind of flow page :

Setting Page --> Enter Password --> Go to Page X

So in setting page, in order to go to page X, I have to enter a password using pop up view. When I'm in page X and i want to go back to previous page, I go to enter password pop up view, instead of the setting page. How do I skip that page?

My pop up view code is something like this :

let btn = storyboard?.instantiateViewController(withIdentifier: "PopUpView") as! PopUpView
        addChild(btn)
        btn.view.frame = view.frame
        view.addSubview(btn.view)
        btn.didMove(toParent: self)

I'm fairly new here, any help will be appreciated.

Thankyou.

use the settings view controller's present function to open the popup.

//In your settings view

func openPopup() {
    let btn = storyboard?.instantiateViewController(withIdentifier: "PopUpView") as! PopUpView
    self.present(btn, animated: true, completion: nil)
}

When the user clicks ok, call dismiss on your popup view and use the closure to initiate the page opening to X

//In your 'PopUpView' On the OK button action of your popup

func didTouchOk() {
    self.dismiss(animated: true) { [weak self] in
        guard let self = self else { return }
            
        //Put your open page X code here
        let XView = storyboard?.instantiateViewController(withIdentifier: "XViewController") as! XView
        self.present(XView, animated: true, completion: nil)
    }
}

if you are using navigationController:

Declare a protocol in your PopUpView

protocol popupDelegate: class {
    func userDidTouchOkInPopup()
}

create a weak var in your PopUpView

weak var delegate: popupDelegate? = nil

In your settings viewcontroller:

Assign delegate to popup before pushing

func openPopup() {
    let btn = storyboard?.instantiateViewController(withIdentifier: 
    "PopUpView") as! PopUpView
    btn.delegate = self
    self.navigationController?.pushViewController(btn, animated: true)
}

Implement an extension for this protocol

extension SettingsViewController:  popupDelegate {

    func userDidTouchOkInPopup() {
        self.navigationController?.popViewController(animated: true)
        let XView = storyboard?.instantiateViewController(withIdentifier: 
        "XViewController") as! XView
        self.navigationController?.pushViewController(XView, animated: true)

    }

}

Modify the Ok action in your PopUpView

//In your 'PopUpView' On the OK button action of your popup

func didTouchOk() {
    self.delegate?.userDidTouchOkInPopup()
}