sdrew · August 23, 2011 00:40 · Aug 22, 2011
diff --git a/gistfile1.m b/gistfile1.m
@@ -0,0 +1,36 @@
+#import "CALayer_HitTestExtensions.h"
+
+#import <objc/runtime.h>
+
+static void *kHitMask;
+
+@implementation CALayer (CALayer_HitTestExtensions)
+
+- (NSUInteger)hitMask
+    {
+    return([objc_getAssociatedObject(self, &kHitMask) unsignedIntegerValue]);
+    }
+
+- (void)setHitMask:(NSUInteger)inHitMask
+    {
+    objc_setAssociatedObject(self, &kHitMask, [NSNumber numberWithUnsignedInteger:inHitMask], OBJC_ASSOCIATION_RETAIN_NONATOMIC);
+    }
+
+- (CALayer *)hitTest:(CGPoint)inPoint mask:(NSUInteger)inMask;
+    {
+    CALayer *theLayer = [self hitTest:inPoint];
+
+    while (theLayer != NULL && theLayer != self)
+        {
+        if (inMask & theLayer.hitMask)
+            {
+            return(theLayer);
+            }
+
+        theLayer = [theLayer superlayer];
+        }
+
+    return(NULL);
+    }
+
+@end