Ex2_AppDelegateUniversalLink.swift

    // AppDelegate
    func application(_ application: UIApplication,
                     continue userActivity: NSUserActivity,
                     restorationHandler:
                     @escaping ([UIUserActivityRestoring]?) -> Void) -> Bool {
        
        // This will allow us to check if we are coming from a universal link
        // and get the url with its components
        
        // The activity type (NSUserActivityTypeBrowsingWeb) is used
        // when continuing from a web browsing session to either
        // a web browser or a native app. Only activities of this
        // type can be continued from a web browser to a native app.
        guard userActivity.activityType == NSUserActivityTypeBrowsingWeb,
          let url = userActivity.webpageURL,
          let components = URLComponents(url: url,
                                         resolvingAgainstBaseURL: true) else {
            return false
        }
        
        // Now that we have the url and its components,
        // we can use this information to present
        // appropriate content in the app
        return true
    }