run hitTest only if necessary

ios/Elements/RNSVGGroup.h

@@ -11,9 +11,12 @@
 #import "RNSVGContainer.h"
 #import "RNSVGNode.h"
 #import "RNSVGCGFCRule.h"
+#import "RNSVGSvgView.h"
 
 @interface RNSVGGroup : RNSVGNode <RNSVGContainer>
 @property (nonatomic, strong) NSString *asClipPath; // Current group is a <ClipPath /> element and asClipPath is its id.
 
 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;
+- (RNSVGSvgView *)getSvgView;
+
 @end

ios/Elements/RNSVGGroup.m

@@ -13,9 +13,15 @@
 - (void)renderLayerTo:(CGContextRef)context
 {
     if (self.asClipPath == NULL) {
+        RNSVGSvgView* svg = [self getSvgView];
         [self clip:context];
+        
         for (RNSVGNode *node in self.subviews) {
             [node renderTo:context];
+            
+            if (node.touchable && !svg.touchable) {
+                self.touchable = YES;
+            }
         }
     } else {
         [self defineClipPath:[self getPath:context] clipPathId:self.asClipPath];
@@ -29,7 +35,6 @@
         CGAffineTransform transform = node.transform;
         CGPathAddPath(path, &transform, [node getPath:context]);
     }
-    
     return path;
 }
 
@@ -39,7 +44,6 @@
 {
     for (RNSVGNode *node in [self.subviews reverseObjectEnumerator]) {
         UIView *view = [node hitTest: point withEvent:event];
-        
         if (view != NULL) {
             return view;
         }
@@ -47,4 +51,14 @@
     return nil;
 }
 
+- (RNSVGSvgView *)getSvgView
+{
+    UIView *parent = self.superview;
+    while ([parent class] != [RNSVGSvgView class]) {
+        parent = parent.superview;
+    }
+    
+    return (RNSVGSvgView *)parent;
+}
+
 @end

ios/Elements/RNSVGSvgView.h

@@ -11,4 +11,7 @@
 #import "RNSVGContainer.h"
 
 @interface RNSVGSvgView : UIView <RNSVGContainer>
+
+@property (nonatomic, assign) BOOL touchable;
+
 @end

ios/Elements/RNSVGSvgView.m

@@ -21,8 +21,13 @@
 - (void)drawRect:(CGRect)rect
 {
     CGContextRef context = UIGraphicsGetCurrentContext();
+    
     for (RNSVGNode *node in self.subviews) {
         [node renderTo:context];
+        
+        if (node.touchable && !self.touchable) {
+            self.touchable = YES;
+        }
     }
 }
 
@@ -31,4 +36,9 @@
     self.backgroundColor = inheritedBackgroundColor;
 }
 
+- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
+{
+    return self.touchable ? [super hitTest:point withEvent:event] : nil;
+}
+
 @end

ios/RNSVGNode.h

@@ -23,6 +23,7 @@
 @property (nonatomic, assign) RNSVGCGFCRule clipRule;
 @property (nonatomic, assign) CGPathRef clipPath; // convert clipPath="M0,0 L0,10 L10,10z" into path
 @property (nonatomic, strong) NSString *clipPathId; // use clipPath="url(#clip)" as ClipPath
+@property (nonatomic, assign) BOOL touchable;
 
 - (void)invalidate;
 - (void)renderTo:(CGContextRef)context;
@@ -53,4 +54,5 @@
 
 
 - (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event;
+
 @end

ios/RNSVGNode.m

@@ -7,7 +7,6 @@
  */
 
 #import "RNSVGNode.h"
-
 #import "RNSVGContainer.h"
 
 static NSMutableDictionary *ClipPaths;

ios/ViewManagers/RNSVGNodeManager.m

@@ -32,5 +32,6 @@ RCT_EXPORT_MODULE()
 RCT_EXPORT_VIEW_PROPERTY(opacity, CGFloat)
 RCT_EXPORT_VIEW_PROPERTY(trans, CGAffineTransform)
 RCT_EXPORT_VIEW_PROPERTY(clipPathId, NSString)
+RCT_EXPORT_VIEW_PROPERTY(touchable, BOOL)
 
 @end