This works for me! class MainTabBarController: UITabBarController { override var selectedIndex: Int { set { if #available(iOS 18.0, *) { UIView.performWithoutAnimation { super.selectedIndex = newValue } } else { super.selectedIndex = newValue } } get { super.selectedIndex } } override var selectedViewController: UIViewController? { set { if #available(iOS 18.0, *) { UIView.performWithoutAnimation { super.selectedViewController = newValue } } else { super.selectedViewController = newValue } } get { super.selectedViewController } } override func viewDidLoad() { super.viewDidLoad() // Do any additional setup after loading the view. } /* // MARK: - Navigation // In a storyboard-based application, you will often want to do a little preparation before navigation override func prepare(for segue: UIStoryboardSegue, sender: Any?) { // Get the new view controller using segue.destination. // Pass the selected object to the new view controller. } */ }