Constraints resets when app is going in background - iOS 13

Question

I have set a view's leading, trailing constraints normally. I have set its height to static 325. And for bottom constraint I have set 2 constraints 1. with main view's bottom constraint to view's bottom constraint. 2. with main view's bottom constraint to view's top constraint. Now on user's action I just show hide view with animation. So when view gets displayed on the screen and the app goes in background then the view's constraint automatically gets altered and the view gets hidden. This issue is only occurring in iOS 13 devices.

I tried to update its constraints on viewWillAppear() but in iOS 13 the viewWillAppear of ViewControllers is also not called when app is activated from background. Also I don't think , that this is a good idea to update constraints.

class ViewController: UIViewController {

    @IBOutlet weak var topConstraint: NSLayoutConstraint!
    @IBOutlet weak var bottomConstraint: NSLayoutConstraint!

    override func viewDidLoad() {
        super.viewDidLoad()
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(true)
        DispatchQueue.main.asyncAfter(deadline: DispatchTime.now() + 3) {
            self.topConstraint.isActive = false
            self.bottomConstraint.isActive = true
            UIView.animate(withDuration: 0.3) {
                self.view.layoutIfNeeded()
            }
        }
    }
}

I don't want my constraints to be changed or updated when app state changes from foreground to background and vice versa.

Please help me with the same.

TIA

Answer 1

Also met this issue. Noticed that constraints keep reseting in case if they are not checked Installed in Interface Builder. So, as workaround keep all constraints Installed in IB and change isActive state just in code.