Implement interactive dismiss for iOS modals

[jacobp100]

Summary:

Currently the swipe-to-dismiss gesture for iOS doesn't work well - it applies friction so you can't pull it down more than a certain amount. The intention for this - from Apple - was if you're editing a form, and you didn't want to accidentally dismiss it. When the user does this gesture, it should be followed by an alert asking them if they wanted to save or cancel

When you're not editing a form, you don't want this friction applied, so the modal can be swiped all the way off the screen. That's what this PR implements via the opt-in prop preventNativeDismiss (=true). The name comes from react-native-screens

This is opt-in and defaults to true (the current behaviour), so there's no breaking changes

See video below

Changelog:

[IOS] [ADDED] - Added preventNativeDismiss prop to modal to opt-in to drag-to-dismiss gestures for modals

Test Plan:

RN Tester

Simulator.Screen.Recording.-.iPhone.SE.3rd.generation.-.2023-07-26.at.17.22.33.mp4

[jacobp100]

I'm pretty sure these were always broken. I've fixed them anyway

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,889,892	+152
android	hermes	armeabi-v7a	7,940,376	+107
android	hermes	x86	9,287,679	+54
android	hermes	x86_64	9,191,362	-96
android	jsc	arm64-v8a	9,479,825	+160
android	jsc	armeabi-v7a	8,422,870	+107
android	jsc	x86	9,463,293	+45
android	jsc	x86_64	9,780,065	-93

Base commit: 3c6dbec
Branch: main

[erquhart]

Thanks so much for opening this @jacobp100!! @NickGerleman @philIip this has been needed for so so long, any chance of moving it forward?

[erquhart]

@NickGerleman apologies for randomly pinging you, just not sure how to get eyes on this and you seem pretty active. This PR is very small and a slam dunk - we cannot pull down on modals to close them in iOS and users expect it. This fixes that.

Any chance of a merge?

The conflict looks to be limited to the example file only.

[github-actions]

This PR is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be closed in 7 days.

[erquhart]

Still needed.

[jacobp100]

[erquhart]

@philIip 🙏

[goguda]

Would love for this to get merged as well