Use locationOfTouch:inView over locationInView for focal (softwar…

…e-mansion#2833)

Replace `locationInView` with `locationOfTouch:inView:` in Pinch handler
to fix truncated focalX and focalY in gesture handler context.

Tested on repro example in (software-mansion#2833).

apple/Handlers/RNPinchHandler.m

@@ -163,8 +163,15 @@ - (RNGestureHandlerEventExtraData *)eventExtraData:(NSMagnificationGestureRecogn
 #else
 - (RNGestureHandlerEventExtraData *)eventExtraData:(UIPinchGestureRecognizer *)recognizer
 {
+  CGPoint accumulatedPoint = CGPointZero;
+  for (int i = 0; i < recognizer.numberOfTouches; i++) {
+    CGPoint location = [recognizer locationOfTouch:i inView:recognizer.view];
+    accumulatedPoint.x += location.x;
+    accumulatedPoint.y += location.y;
+  }
+  CGPoint focalPoint = CGPointMake(accumulatedPoint.x / recognizer.numberOfTouches, accumulatedPoint.y / recognizer.numberOfTouches);
   return [RNGestureHandlerEventExtraData forPinch:recognizer.scale
-                                   withFocalPoint:[recognizer locationInView:recognizer.view]
+                                   withFocalPoint:focalPoint
                                      withVelocity:recognizer.velocity
                               withNumberOfTouches:recognizer.numberOfTouches
                                   withPointerType:_pointerType];