Tabbar not selected on notification

Question

I have a navigationVIewController as a rootViewController at one case and a viewController as a rootViewController in one case.

When the rootViewController is the viewController, i'm unable to show the viewController at that tabbar using the below code, in the didRecieveRemoteNotification method.

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any], fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {      

    if let type = userInfo["type"] as! String! {
        if UIApplication.shared.applicationState == .inactive {

            if self.window?.rootViewController as? UINavigationController != nil {
                //Works Fine
            } else {
                let storyBoard = UIStoryboard(name: "Main", bundle: nil)
                let myNavigationController = storyBoard.instantiateViewController(withIdentifier: "navBarID") as! UINavigationController
                let myTabbarController = myNavigationController.viewControllers[0] as! UITabBarController

                if type == "newsfeed" {
                    myTabbarController.selectedViewController = myTabbarController.viewControllers![3]
                } else if type == "event" {
                    myTabbarController.selectedViewController = myTabbarController.viewControllers![2]
                }                    
            }
        } else {
            // Foreground

        }
    }
}