fix (iOS): Swipe down to dismiss screen with ScrollView on iOS

[RaphBlanchet]

Description

Following the changes done in PR #1512, we encountered an issue where we couldn't swipe down to dismiss a modal screen on iOS if this screen contained a ScrollView.

To fix this, we made some check in the RNSScreenStack.mm file, more specifically in the - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer method to check if the gesture is coming from a ScrollView, and if so, check if this scroll view's content offset is less than or equal to 0. If so, we allow the swipe to dismiss gesture and cancel the scroll view's gesture.

Changes

• Added fix in RNNScreenStack.mm
• Added a reproducible example Test1902 in TestsExample

Screenshots / GIFs

Simulator.Screen.Recording.-.iPhone.14.Pro.-.2023-09-26.at.10.39.56.mp4

Test code and steps to reproduce

See Test1902 in TestsExample. In order to enable this feature, you need to have these options :

animation: 'slide_from_bottom',
fullScreenGestureEnabled: true, 
gestureDirection: 'vertical'

Checklist

• Included code example that can be used to test this change
• Updated TS types
• Updated documentation:
  • https://github.com/software-mansion/react-native-screens/blob/main/guides/GUIDE_FOR_LIBRARY_AUTHORS.md
  • https://github.com/software-mansion/react-native-screens/blob/main/native-stack/README.md
  • https://github.com/software-mansion/react-native-screens/blob/main/src/types.tsx
  • https://github.com/software-mansion/react-native-screens/blob/main/src/native-stack/types.tsx
• Ensured that CI passes

[alecmarcus]

Is merging this PR on anybody's radar? It's a valuable fix that I will have to pull in as a patch.