From 6ecd9a43f16e76771e2f970972bcd067aa570cf7 Mon Sep 17 00:00:00 2001
From: Jakub Piasecki <piaseckijakub@meta.com>
Date: Wed, 12 Mar 2025 03:50:07 -0700
Subject: [PATCH] Fix touch events not being dispatched to ScrollView's
 children when they overflow content container (#49855)

Summary:
Pull Request resolved: https://github.com/facebook/react-native/pull/49855

Changelog: [IOS][FIXED] - Fixed touch events not being dispatched to ScrollView's children when they overflow the content container

Closes https://github.com/facebook/react-native/issues/47740.

Changes the ScrollView's container view to be `RCTViewComponentView` instead of `UIView` and sets custom layout metrics to it in a way that it will propagate touch events to all children, even if they overflow its bounds.

Reviewed By: sammy-SC

Differential Revision: D70619894

fbshipit-source-id: 348a1a369489d5208d6037c8d76b223c4ab2d5f7
---
 .../ScrollView/RCTScrollViewComponentView.mm             | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/packages/react-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm b/packages/react-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm
index d029337fb0d..9b4e6aad2ec 100644
--- a/packages/react-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm
+++ b/packages/react-native/React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm
@@ -89,6 +89,7 @@ RCTSendScrollEventForNativeAnimations_DEPRECATED(UIScrollView *scrollView, NSInt
 
 @implementation RCTScrollViewComponentView {
   ScrollViewShadowNode::ConcreteState::Shared _state;
+  LayoutMetrics _lastContentContainerLayoutMetrics;
   CGSize _contentSize;
   NSTimeInterval _lastScrollEventDispatchTime;
   NSTimeInterval _scrollEventThrottle;
@@ -132,7 +133,7 @@ RCTSendScrollEventForNativeAnimations_DEPRECATED(UIScrollView *scrollView, NSInt
     _automaticallyAdjustKeyboardInsets = NO;
     [self addSubview:_scrollView];
 
-    _containerView = [[UIView alloc] initWithFrame:CGRectZero];
+    _containerView = [[RCTViewComponentView alloc] initWithFrame:CGRectZero];
     [_scrollView addSubview:_containerView];
 
     [self.scrollViewDelegateSplitter addDelegate:self];
@@ -468,7 +469,11 @@ static inline UIViewAnimationOptions animationOptionsWithCurve(UIViewAnimationCu
   }
 
   _contentSize = contentSize;
-  _containerView.frame = CGRect{RCTCGPointFromPoint(data.contentBoundingRect.origin), contentSize};
+  LayoutMetrics newContentContainerLayoutMetrics = LayoutMetrics{
+      .frame = {.origin = data.contentBoundingRect.origin, .size = data.getContentSize()}, .overflowInset = {.top = 1}};
+  [_containerView updateLayoutMetrics:newContentContainerLayoutMetrics
+                     oldLayoutMetrics:_lastContentContainerLayoutMetrics];
+  _lastContentContainerLayoutMetrics = newContentContainerLayoutMetrics;
 
   [self _preserveContentOffsetIfNeededWithBlock:^{
     self->_scrollView.contentSize = contentSize;