Fabric: findScrollViewComponentViewForView was moved to RCTScrollViewComponentView

Summary: This way we can reuse this code in other RCTScrollViewComponentView-satellite components, especially in standard pull-to-refresh component.

Reviewed By: mdvacca

Differential Revision: D15403307

fbshipit-source-id: 5999f851f22db0f358887e1a86d610e163adcb1d

React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.h

@@ -22,6 +22,11 @@ NS_ASSUME_NONNULL_BEGIN
  */
 @interface RCTScrollViewComponentView : RCTViewComponentView
 
+/*
+ * Finds and returns the closet RCTScrollViewComponentView component to the given view
+ */
++ (RCTScrollViewComponentView *_Nullable)findScrollViewComponentViewForView:(UIView *)view;
+
 /*
  * Returns an actual UIScrollView that this component uses under the hood.
  */

React/Fabric/Mounting/ComponentViews/ScrollView/RCTScrollViewComponentView.mm

@@ -31,6 +31,14 @@ using namespace facebook::react;
   CGSize _contentSize;
 }
 
++ (RCTScrollViewComponentView *_Nullable)findScrollViewComponentViewForView:(UIView *)view
+{
+  do {
+    view = view.superview;
+  } while (view != nil && ![view isKindOfClass:[RCTScrollViewComponentView class]]);
+  return (RCTScrollViewComponentView *)view;
+}
+
 - (instancetype)initWithFrame:(CGRect)frame
 {
   if (self = [super initWithFrame:frame]) {