fix: handle multiple gesture recognizers (#1512)

* fix: handle multiple gesture recognizers

* fix: improve gestureRecognizer logic

* chore: make screen stack gesture recognizers do not receive events in
some cases

Now screen stack gesture recognizers do not receive events when gestures
are disabled or there is no screen to navigate to

* chore: simplify & improve gesture recognizer logic

Author: kkafar

ios/RNSScreenStack.mm

@@ -600,27 +600,22 @@ - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
 {
   RNSScreenView *topScreen = (RNSScreenView *)_controller.viewControllers.lastObject.view;
 
-  if (![topScreen isKindOfClass:[RNSScreenView class]] || !topScreen.gestureEnabled ||
-      _controller.viewControllers.count < 2) {
-    return NO;
-  }
-
 #if TARGET_OS_TV
   [self cancelTouchesInParent];
   return YES;
 #else
-  if (topScreen.fullScreenSwipeEnabled) {
-    // we want only `RNSPanGestureRecognizer` to be able to recognize when
-    // `fullScreenSwipeEnabled` is set, and we are in the bounds set by user
-    if ([gestureRecognizer isKindOfClass:[RNSPanGestureRecognizer class]] &&
-        [self isInGestureResponseDistance:gestureRecognizer topScreen:topScreen]) {
+  // RNSPanGestureRecognizer will receive events iff topScreen.fullScreenSwipeEnabled == YES;
+  // Events are filtered in gestureRecognizer:shouldReceiveEvent: method
+  if ([gestureRecognizer isKindOfClass:[RNSPanGestureRecognizer class]]) {
+    if ([self isInGestureResponseDistance:gestureRecognizer topScreen:topScreen]) {
       _isFullWidthSwiping = YES;
       [self cancelTouchesInParent];
       return YES;
     }
     return NO;
   }
 
+  // Now we're dealing with RNSScreenEdgeGestureRecognizer (or _UIParallaxTransitionPanGestureRecognizer)
   if (topScreen.customAnimationOnSwipe && [RNSScreenStackAnimator isCustomAnimation:topScreen.stackAnimation]) {
     if ([gestureRecognizer isKindOfClass:[RNSScreenEdgeGestureRecognizer class]]) {
       // if we do not set any explicit `semanticContentAttribute`, it is `UISemanticContentAttributeUnspecified` instead
@@ -639,10 +634,8 @@ - (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
     if ([gestureRecognizer isKindOfClass:[RNSScreenEdgeGestureRecognizer class]]) {
       // it should only recognize with `customAnimationOnSwipe` set
       return NO;
-    } else if ([gestureRecognizer isKindOfClass:[RNSPanGestureRecognizer class]]) {
-      // it should only recognize with `fullScreenSwipeEnabled` set
-      return NO;
     }
+    // _UIParallaxTransitionPanGestureRecognizer (other...)
     [self cancelTouchesInParent];
     return YES;
   }
@@ -819,16 +812,51 @@ - (BOOL)isScrollViewPanGestureRecognizer:(UIGestureRecognizer *)gestureRecognize
   return scrollView.panGestureRecognizer == gestureRecognizer;
 }
 
+// RNSScreenStackView is a UIGestureRecognizerDelegate for three types of gesture recognizers:
+// RNSPanGestureRecognizer, RNSScreenEdgeGestureRecognizer, _UIParallaxTransitionPanGestureRecognizer
+// Be careful when adding another type of gesture recognizer.
+- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveEvent:(UIEvent *)event
+{
+  RNSScreenView *topScreen = (RNSScreenView *)_controller.viewControllers.lastObject.view;
+
+  if (![topScreen isKindOfClass:[RNSScreenView class]] || !topScreen.gestureEnabled ||
+      _controller.viewControllers.count < 2) {
+    return NO;
+  }
+
+  // We want to pass events to RNSPanGestureRecognizer iff full screen swipe is enabled.
+  if ([gestureRecognizer isKindOfClass:[RNSPanGestureRecognizer class]]) {
+    return topScreen.fullScreenSwipeEnabled;
+  }
+
+  // RNSScreenEdgeGestureRecognizer || _UIParallaxTransitionPanGestureRecognizer
+  return YES;
+}
+
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
     shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 {
-  return [self isScrollViewPanGestureRecognizer:otherGestureRecognizer];
+  if ([gestureRecognizer isKindOfClass:[RNSPanGestureRecognizer class]] &&
+      [self isScrollViewPanGestureRecognizer:otherGestureRecognizer]) {
+    RNSPanGestureRecognizer *panGestureRecognizer = (RNSPanGestureRecognizer *)gestureRecognizer;
+    BOOL isBackGesture = [panGestureRecognizer translationInView:panGestureRecognizer.view].x > 0 &&
+        _controller.viewControllers.count > 1;
+
+    if (gestureRecognizer.state == UIGestureRecognizerStateBegan || isBackGesture) {
+      return NO;
+    }
+
+    return YES;
+  }
+  return NO;
 }
 
 - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
     shouldBeRequiredToFailByGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
 {
-  return [self isScrollViewPanGestureRecognizer:otherGestureRecognizer];
+  return (
+      [gestureRecognizer isKindOfClass:[UIScreenEdgePanGestureRecognizer class]] &&
+      [self isScrollViewPanGestureRecognizer:otherGestureRecognizer]);
 }
 
 - (void)insertReactSubview:(RNSScreenView *)subview atIndex:(NSInteger)atIndex