ViewController.swift

import UIKit
import Combine

...

class ViewController: UIViewController {
    ...
    
    override func viewDidLoad() {
        super.viewDidLoad()
        overrideUserInterfaceStyle = .light
        
        getAvatarFromTheServer()
            .handleEvents(...)
            //
            .delay(for: 1, scheduler: DispatchQueue.global())
            //
            .retry(3)
            .receive(on: DispatchQueue.main)
            .sink(...)
            .store(in: &cancellables)
    }
    
    private func getAvatarFromTheServer() -> AnyPublisher<UIImage, Error> {
        ...
    }

}