fix(ios): ensure contentView forwards touches after glass effect setup

[Dhruv317]

Problem

When LiquidGlassView is used in React Native (Fabric renderer) with interactive child components like Pressable, touches intermittently fail to reach those children. The bug is session-level: either all LiquidGlassView instances work for the entire app session, or none of them do. A cold restart may or may not fix it.

Root Cause

There is a race condition between Fabric's component mount pass and UIKit's layout pass.

LiquidGlassViewImpl.setupView() is called from layoutSubviews() and applies the UIGlassEffect via self.effect = glassEffect. When UIGlassEffect is applied, UIKit internally reconfigures the contentView (_UIVisualEffectContentView). If no subviews are present in contentView at that moment, the contentView can end up with userInteractionEnabled == false.

In Fabric, child component views are mounted into contentView via mountChildComponentView:index: — but this can happen after layoutSubviews has already triggered setupView(). The ordering depends on main thread scheduling and varies per app launch.

Once setupView() runs and the layoutSubviews guard (if self.effect != nil { return }) prevents it from re-running, the contentView touch state is locked for the lifetime of that view.

Timeline — broken session:

1. layoutSubviews → setupView() → self.effect = glassEffect → contentView.isUserInteractionEnabled set to false (no subviews yet)
2. Fabric mounts Pressable children into contentView
3. Children are visible but never receive touches

Timeline — working session:

1. Fabric mounts Pressable children into contentView
2. layoutSubviews → setupView() → self.effect = glassEffect → contentView touch handling set up correctly (subviews present)
3. Everything works

Fix

Explicitly set self.contentView.isUserInteractionEnabled = true after every effect application in setupView(). This guarantees touches always flow through to child views regardless of mount ordering.

Environment

• iOS 26 beta (26.1)
• React Native 0.83 (Fabric / New Architecture)
• @callstack/liquid-glass 0.7.0

Reproduction

<LiquidGlassView effect="regular" style={{ borderRadius: 25, padding: 16 }}>
  <Pressable onPress={() => console.log('pressed')}>
    <Text>Tap me</Text>
  </Pressable>
</LiquidGlassView>

Cold-restart the app multiple times. On some launches, the Pressable will not respond to taps. Once it fails, it stays broken for the entire session. Once it works, it stays working.

[hgaddipati1118]

Would love this to get merged is a pretty big bug for us :)

[atlj]

I couldn't reproduce the issue with the given snippet, but I'm assuming you're seeing the issue on a real-world app with actual CPU load.
After seeing the docs for isUserInteractionEnabled, I'm thinking this is good to merge since we don't have any actual reason for this to be false.

[satya164]

Thanks for the PR