LEShapeLayer.h

// Simply animates it's path along with bound change animations (if the path is changed along with the bounds that is)
@interface LEShapeLayer : CAShapeLayer
@end

@interface LEShapeView : UIView
@property(nonatomic, readonly) LEShapeLayer *shapeLayer;
@property(nonatomic, readonly) CGPathRef hitTestPath;
@end

LEShapeLayer.m

#import "LEShapeLayer.h"

@implementation LEShapeLayer
- (void)addAnimation:(CAAnimation *)aAnim forKey:(NSString *)aKey
{
    [super addAnimation:aAnim forKey:aKey];
    
    if([aKey isEqualToString:@"bounds"] || [aKey isEqualToString:@"bounds.size"]) {
        CABasicAnimation * const pathAnim = [CABasicAnimation animationWithKeyPath:@"path"];
        pathAnim.delegate       = aAnim.delegate;
        pathAnim.duration       = aAnim.duration;
        pathAnim.fillMode       = aAnim.fillMode;
        pathAnim.timingFunction = aAnim.timingFunction;
        [self addAnimation:pathAnim forKey:@"path"];
        
        CABasicAnimation * const contentAnim = [pathAnim copy];
        contentAnim.keyPath = @"contents";
        [self addAnimation:contentAnim forKey:@"contents"];
    }
}
@end

@implementation LEShapeView
+ (Class)layerClass
{
    return [LEShapeLayer class];
}
- (LEShapeLayer *)shapeLayer
{
    return (LEShapeLayer *)self.layer;
}
- (CGPathRef)hitTestPath
{
    return self.shapeLayer.path;
}
- (BOOL)pointInside:(CGPoint const)aPoint withEvent:(UIEvent * const)aEvent
{
    return self.hitTestPath && CGPathContainsPoint(self.hitTestPath, NULL, aPoint, false);
}
@end