How to write func..(for sequels: UIStoryboardSeque, sender: Any?) programmatically

I have these codes when I use storyboard:

 override func prepare (for segue: UIStoryboardSegue, sender: Any?) {

    if segue.identifier == ProfilePhotoViewController.identifier {
      guard let username = usernameTextField.text, let email = emailTextField.text, let password = passwordTextField.text else { return }
      
      let profilePhotoVC = segue.destination as! ProfilePhotoViewController
      profilePhotoVC.email = email
      profilePhotoVC.username = username
      profilePhotoVC.password = password
    }
  }

How do I write these code if I don't use storyboard and write them programmatically in order to pass the info from current controller to ProfilePhotoViewController?

EDIT: After doing research I understand that doing this programmatically is through delegate. However, I don't know how I can complete the code:

Need to pass username, email and password from SignUpController ---> profilePhotoViewController

in SignUpController:

protocol SignUpControllerDelegate {
     func handleSignUp(//what should I write here?)
}

var delegate: SignUpControllerDelegate?

@objc func handleSignUp() {

//...other code..//

delegate?.handleSignUp(//??)
}

In ProfileViewController:

what should I write to receive the username, email and password info from SignUpController?

Try like this

guard let username = usernameTextField.text, let email = emailTextField.text, let password = passwordTextField.text else { return }

let profileVC = ProfilePhotoViewController()
profileVC.email = email