[iOS] Navigate from react native view to native view will make the app unresponsive to input

[wgundamj44]

Description

After #3173 is merged, the RNScreen would disable the user interaction of the window before it disappears. But in brownfield integration when users navigate from react native view to native view, the user interaction is never restored, causing the app not respond to user input.

I already saw issue #3388 which is caused by the same change, but not sure if its PR could fix the brownfield use case.

Steps to reproduce

1. start the dev server
2. run the app
3. navigate to the native view
4. the native view won't respond to tap

Snack or a link to a repository

https://github.com/wgundamj44/rnscreen-brownfield-demo

Screens version

4.18

React Native version

0.81.4

Platforms

iOS

JavaScript runtime

None

Workflow

None

Architecture

None

Build type

None

Device

None

Device model

No response

Acknowledgements

Yes

[xieweizhi]

We faced the same issue in our brownfield project. Here is what I found.

Root Cause

The iOS 26-specific code in react-native-screens disables window.userInteractionEnabled during view controller transitions to prevent mid-transition (https://github.com/software-mansion/react-native-screens/pull/3173/files#diff-ad35cf2dc9a86855afc1d2443a42a133ccf0dd8b17589719cb1aab4a81d20604R745-R757).
However, it only re-enables this for RNSScreen instances in their viewDidAppear method.

When pushing native UIViewControllers (non-RNSScreen):

1. RNSScreen.willMoveToWindow: disables window.userInteractionEnabled = false
2. Native VC's viewDidAppear: is called, but doesn't re-enable interaction
3. Result: The native view appears but is completely unresponsive to touch

Affected: iOS 26+ only, brownfield apps mixing React Native and native navigation

---

Solution : re-enable userInteractionEnabled in UINavigationControllerDelegate

class NavigationDelegate: NSObject, UINavigationControllerDelegate {
    func navigationController(_ navigationController: UINavigationController,
                            didShow viewController: UIViewController,
                            animated: Bool) {
        if #available(iOS 26, *) {
            if let window = viewController.view.window,
               !window.isUserInteractionEnabled {
                window.isUserInteractionEnabled = true
            }
        }
    }
}

[kmichalikk]

Hi @wgundamj44, @xieweizhi

similarly to #3388, I tested with the provided repro - window remains unresponsive on 4.18 but works on nightly. Please verify this on your setup & let me know so we can close the issue.