In iOS 18, UINavigationController continuously executes pushViewController, and the lifecycle method is not executed when the viewController enters the stack

Question

Created Dec ’24

Replies 2

Boosts 0

Participants 2

  let home = homeViewController()
    let rootNav = UINavigationController(rootViewController: home)
    
    
    window?.rootViewController = rootNav
    window?.makeKeyAndVisible()
    
    
    
    let second = SecondViewController()
    home.navigationController?.pushViewController(second, animated: false)

    
    let third = ThirdViewController()
    home.navigationController?.pushViewController(third, animated: false)

After the above is executed, the viewdidload and other related lifecycle methods in the SecondViewController are not executed。

Except for iOS18, other versions don't have this problem, so it's not a bug in iOS18, or iOS18 has optimized UINavigationController

Answer 1 · Dec 24, 2024 12:00 AM

zhujinlong OP

Dec ’24

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

Answer 2 · Jan 2, 2025 08:42 AM

Frameworks Engineer OP

Apple

Jan ’25

This is likely an expected behavior change in iOS 18. As UIKit doesn't get a change to display second before you push third there is no guarantee that we will treat it as having gotten on screen and therefore call any of its lifecycle methods.