viewController+APIClient.swift

import UIKit

final class ViewController: UIViewController {
    
    let apiClient = APIClient()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let resource = Resource(url: URL(string: "https://desolate-beyond-86929.herokuapp.com/arrival")!)
        apiClient.load(resource) { (result) in
            switch result {
            case .success(let data):
                print("\(self) retrive data: \(String(data: data, encoding: .utf8)) from resource: \(resource)")
            case .failure(let error):
                print("\(self) retrive error: \(error) from resource: \(resource)")
            }
        }
    }

}