Task Demo.swift

//
//  ViewController.swift
//  task-test
//
//  Created by Seb Vidal on 18/08/2022.
//

import UIKit

class FirstViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    @IBAction func buttonTapped(_ sender: Any) {
        let vc = SecondViewController()
        navigationController?.pushViewController(vc, animated: true)
        vc.performTask()
    }
}

class SecondViewController: UIViewController {
    let viewModel = ViewModel()
    
    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = .white
    }
    
    func performTask() {
        Task {
            await viewModel.fetchData(viewController: self)
        }
    }
    
    func printMessage() {
        print("Here")
    }
}

class ViewModel {
    init() {
        print("init()")
    }
    
    func fetchData(viewController: SecondViewController) async {
        DispatchQueue.main.asyncAfter(deadline: .now() + 10) {
            viewController.printMessage()
        }
    }
    
    deinit {
        print("deinit")
    }
}