DelegateTutorialFirstViewController

DelegateTutorialFirstViewController.swift

import UIKit

class FirstViewController: UIViewController, SecondViewControllerProtocol {

    // MARK: - Navigation
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "FirstToSecondSegue" {
            if let vc = segue.destination as? SecondViewControllerProtocol {
                vc.delegate = self
            }
        }
    }
  
    //MARK: - SecondViewControllerDelegate
    func didDoSomethingOnSecondViewController(message: String) {
        let alert = UIAlertController(title: "Delegate", message: "\(message)", preferredStyle: .alert)
        let action = UIAlertAction(title: "OK", style: .cancel, handler: nil);
        alert.addAction(action)
        self.present(alert, animated: true, completion: nil)
    }
}