Add category on UIView with code for touch handler finding

ios/utils/UIView+RNSUtility.h

@@ -0,0 +1,23 @@
+#import <Foundation/Foundation.h>
+
+#ifdef RCT_NEW_ARCH_ENABLED
+#import <React/RCTSurfaceTouchHandler.h>
+#else
+#import <React/RCTTouchHandler.h>
+#endif // RCT_NEW_ARCH_ENABLED
+
+#ifdef RCT_NEW_ARCH_ENABLED
+#define RNS_TOUCH_HANDLER_ARCH_TYPE RCTSurfaceTouchHandler
+#else
+#define RNS_TOUCH_HANDLER_ARCH_TYPE RCTTouchHandler
+#endif // RCT_NEW_ARCH_ENABLED
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIView (RNSUtility)
+
+- (nullable RNS_TOUCH_HANDLER_ARCH_TYPE *)rnscreens_findTouchHandlerInAncestorChain;
+
+@end
+
+NS_ASSUME_NONNULL_END

ios/utils/UIView+RNSUtility.mm

@@ -0,0 +1,55 @@
+
+#import "UIView+RNSUtility.h"
+
+#ifdef RCT_NEW_ARCH_ENABLED
+#import <React/RCTSurfaceView.h>
+#endif
+
+@implementation UIView (RNSUtility)
+
+- (nullable RNS_TOUCH_HANDLER_ARCH_TYPE *)rnscreens_findTouchHandlerInAncestorChain
+{
+  UIView *parent = self;
+
+#ifdef RCT_NEW_ARCH_ENABLED
+  // On Fabric there is no view that exposes touchHandler above us in the view hierarchy, however it is still
+  // utilised. `RCTSurfaceView` should be present above us, which hosts `RCTFabricSurface` instance, which in turn
+  // hosts `RCTSurfaceTouchHandler` as a private field. When initialised, `RCTSurfaceTouchHandler` is attached to the
+  // surface view as a gestureRecognizer <- and this is where we can lay our hands on it.
+
+  while (parent != nil && ![parent isKindOfClass:RCTSurfaceView.class]) {
+    parent = parent.superview;
+  }
+
+  // This could be possible in modal context
+  if (parent == nil) {
+    return nil;
+  }
+
+  // Experimentation shows that RCTSurfaceTouchHandler is the only gestureRecognizer registered here,
+  // so we should not be afraid of any performance hit here.
+  for (UIGestureRecognizer *recognizer in parent.gestureRecognizers) {
+    if ([recognizer isKindOfClass:RCTSurfaceTouchHandler.class]) {
+      return static_cast<RNS_TOUCH_HANDLER_ARCH_TYPE *>(recognizer);
+    }
+  }
+
+#else
+
+  // On Paper we can access touchHandler hosted by `RCTRootContentView` which should be above ScreenStack
+  // in view hierarchy.
+  while (parent != nil && ![parent respondsToSelector:@selector(touchHandler)]) {
+    parent = parent.superview;
+  }
+
+  if (parent != nil) {
+    RCTTouchHandler *touchHandler = [parent performSelector:@selector(touchHandler)];
+    return static_cast<RNS_TOUCH_HANDLER_ARCH_TYPE *>(touchHandler);
+  }
+
+#endif // RCT_NEW_ARCH_ENABLED
+
+  return nil;
+}
+
+@end