The main thing is that only IOS18 can reproduce.,I understand that he did the memory optimization on this side.,Load on demand.,This should be a good thing.,But the official didn't put forward a description of the optimization.,This bothers me.,I need to be able to prove why only IOS18 has this problem.

class HomeViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() print("HomeViewController viewDidLoad") } } class SecondViewController: UIViewController { override func viewDidLoad() { super.viewDidLoad() print("SecondViewController viewDidLoad") } } @UIApplicationMain class AppDelegate: UIResponder, UIApplicationDelegate { var window: UIWindow? func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool { window = UIWindow(frame: UIScreen.main.bounds) let home = HomeViewController() let rootNav = UINavigationController(rootViewController: home) window?.rootViewController = rootNav window?.makeKeyAndVisible() let secondViewController = SecondViewController() home.navigationController?.pushViewController(secondViewController, animated: true) return true } }

The ThirdViewController call pop to return to the SecondViewController page is a lifecycle execution method, which is strange if it is an IOS18 bug