joseph-elmallah

import UIKit

// The status of an error handler
enum ErrorHandlingStatus {
    /// The error was handled successfully and the propagation should stop
    case handled
    /// The error was not handled and the should be propagated further more
    case unhandled
}

joseph-elmallah

/// Conforming to this protocol allows for URL handling
protocol URLHandler {
    /// Handle a URL
    ///
    /// - Parameter url: The propagated url
    /// - Returns: The handled status
    func handleURL(_ url: URL, options: [UIApplication.OpenExternalURLOptionsKey : Any], completionHandler completion: ((Bool) -> Void)?)
}

// MARK: - Error Propagation

joseph-elmallah

// MARK: - URLHandler conformance
extension UIApplication: URLHandler {
    func handleURL(_ url: URL, options: [UIApplication.OpenExternalURLOptionsKey : Any], completionHandler completion: ((Bool) -> Void)?) {
        // If we reach the end of the responder chain without anyone handeling the URL, ask the Applciation to handle it
        open(url, options: options, completionHandler: completion)
    }
}

joseph-elmallah

import UIKit

// This is a snippet for the Medium article: 

// UIViewController that shows a board of 10x10 cells of Game of Life implementation.
class ViewController: UIViewController, GofCoreDisplayDriver {
    
    /// The board is square. This defines the edge size of the board (10 x 10)
    private let boardSize: Int = 10