AppDelegate for DeepLink

//Requirements in AppDelegate for DeepLinking in Swift 3.

class AppDelegate: UIResponder, UIApplicationDelegate {
    var window: UIWindow?
    var deepLink: RemoteNotificationDeepLink?

    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any]) -> Bool {
        handleDeepLink(app: app, url: url)
        //...
        return false
    }

    func handleDeepLink(app: UIApplication, url: URL) {
        guard url.host != nil else { return }
        let urlString = url.absoluteString
        let data = urlString.components(separatedBy: "/")

        guard data.count >= 3 else { return }
        let query = data[2]
        let parameter = data[3]

        guard query.range(of: "app") != nil else { return }
        let userInfo = ["app": parameter ]
        self.applicationHandleRemoteNotification(app, didReceiveRemoteNotification: userInfo)
    }

    func applicationHandleRemoteNotification(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any]) {
        if application.applicationState == UIApplicationState.background || application.applicationState == UIApplicationState.inactive {
            self.deepLink = RemoteNotificationDeepLink.create(userInfo)
            triggerDeepLinkIfPresent()
        }
    }

    func triggerDeepLinkIfPresent() -> Bool {
        let ret = (self.deepLink?.trigger() != nil)
        self.deepLink = nil
        return ret
    }
}