func tabBarController(_ tabBarController: UITabBarController, shouldSelect viewController: UIViewController) -> Bool {
    if viewController is PopupViewController {
        if let popupView = tabBarController.storyboard?.instantiateInitialViewController() {
            popupView.modalPresentationStyle = .fullScreen
            tabBarController.present(popupView, animated: true, completion: nil)

            return false
        }
    }
    return true
}