The conformance of UIApplication to the URLHandler protocol

UIApplication+URLHandler.swift

// 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)
    }
}