Scroll to top on tab bar controller pressed

gistfile1.txt

    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        let topIndex = IndexPath(row: 0, section: 0)
        if let navController = viewController as? UINavigationController,
            navController.childViewControllers.count > 0 {
            let childController = navController.childViewControllers[0]
            if let vc = childController as? AlbumsTableViewController {
                vc.tableView.scrollToRow(at: topIndex, at: .top, animated: true)
            } else if let vc = childController as? ArtistsTableViewController {
                vc.tableView.scrollToRow(at: topIndex, at: .top, animated: true)
            }
        }
    }