Add interactive dismiss enabled to add full support for iOS 13 style page sheet modals

[jacobp100]

Summary

Add interactive dismiss enabled to add full support for iOS 13 style page sheet modals

See #31500

In this PR, only support for partial drag is added. i.e. user can't drag the modal up and down completely. I added full user dragging but reverted in this commit to support controllable onRequestClose. If someone has any suggestion to have full draggable support + controllable onRequestClose, please let me know.

In the current behaviour, there's friction when dismissing. This enables removing that friction via a new interactiveDismissEnabled prop.

When using this prop, you must implement onDismiss - and that callback must lead to setting visible: false.

I felt this was consistent, because onDismiss was called when a modal was fully dismissed. When using the interactive dismissal, we only get notified when it's actually dismissed.

This feature is opt-in to maintain backwards compatibility.

Changelog

[iOS] [Added] - Added interactiveDismissEnabled prop to Modal component

Test Plan

Added example in RN tester. Video below.

Screen.Recording.2021-09-28.at.19.07.35.mov

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 16397e0
Branch: main

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,810,106	+375
android	hermes	armeabi-v7a	7,201,790	+380
android	hermes	x86	8,118,851	+378
android	hermes	x86_64	8,099,084	+434
android	jsc	arm64-v8a	9,643,975	+399
android	jsc	armeabi-v7a	8,418,241	+412
android	jsc	x86	9,593,192	+423
android	jsc	x86_64	10,190,400	+452

Base commit: 16397e0
Branch: main

[vbylen]

Any hope of this being merged?

[jacobp100]

I've fixed the merge conflicts

[jacobp100]

I believe this has already been merged in via other PRs

[burakgormek]

I think this still needed, or am I missing something? Mentioned PR doesn't seem to have this functionality.

[erquhart]

@jacobp100 this was never merged or addressed in other PR's, any chance of revisiting? There is currently no way to present a native modal in iOS that can be dismissed smoothly via swipe down, including community libraries. We really need this.

[erquhart]

Actually it looks like this is superseded by: #38641