feat(iOS): introduce modal dismiss event on drag down attempt

[gtokman]

Description

As described in this discussion, this PR intercepts the event when a user tries to drag down the view, allowing to perform additional actions, such as displaying an Action Sheet for confirmation.

Changes

• Updated types.tsx
• RNSScreen.h
• RNSScreen.mm

Screenshots / GIFs

test.mp4

Test code and steps to reproduce

Not yet, but requires gestureEnabled: false and onModalDismiss: () => showActionSheet()

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

[tboba]

Hi @gtokman, thanks for opening this issue! 🥳
Unfortunately our CD is failing on the method onModalDismiss(nil) 😕 Also, I don't know if I understand the onModalDismiss prop correctly - where are we passing the logic of this function to the native code?