if UIApplication.shared.canOpenURL(url) {
            let appURL = URL(string: "youtube://\(urlString)")!
            if UIApplication.shared.canOpenURL(appURL) {
                UIApplication.shared.open(appURL, options: [:], completionHandler: nil)
            } else {
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            }
        }