IOS CALayer and TapGestureRecognizer

I am developing an iOS 6.1 app for iPad. I have a problem with CALayer

and TapGestureRecognizer

.

I have 7 CALayers

rainbow shapers (each layer is a color). Each layer is built using the CAShapeLayer

generated from CGMutablePathRef

. Everything works fine. All the layers are drawn on the screen and I can see a beautiful rainbow.

Now I want to detect click over one color / layer. I am trying like this:

- (void)tap:(UITapGestureRecognizer*)recognizer
{
   //I've had the tapGestureRecognizer to rainbowView (that is an UIView) in viewDidLoad
  CGLayer* tappedLayer = [rainbowView.layer.presentationlayer hitTest:[recognizer locationInView:rainbowView];

  if (tappedLayer == purpleLayer) //for example
         NSLog(@"PURPLE!");
}

      

        
        
        
      

    

I don't understand why this code won't work! I already have hitTest:

other threads here: all suggest a hitTest:

method for solving similar problems. But in my case, I cannot get the desired result. Can anyone help me? Thank!!

EDIT:

Here is the code for creating paths and layers:

- (void)viewDidLoad
{
     //Other layers
     ...
     ...
     //Purple Arc
     purplePath = CGPathCreateMutable();
     CGPathMoveToPoint(purplePath, NULL, 150, 400);
     CGPathAddCurveToPoint(purplePath, NULL, 150, 162, 550, 162, 550, 400);
     purpletrack = [CAShapeLayer layer];
     purpletrack.path = purplePath;
     purpletrack.strokeColor = [UIColor colorWithRed:134.0/255.0f green:50.0/255.0f blue:140.0/255.0f alpha:1.0].CGColor;
     purpletrack.fillColor = nil;
     purpletrack.lineWidth = 25.0;
     [rainbowView.layer insertSublayer:purpletrack above:bluetrack];
}

      

        
        
        
      

    

This was my first approach to the problem. And the touch didn't work.

I also tried to create a class RainbowView

that draws the rainbow in a method drawRect

using UIBezierPaths

. Then I follow the section on "Path Hit Detection" at http://developer.apple.com/library/ios/#documentation/2ddrawing/conceptual/drawingprintingios/BezierPaths/BezierPaths.html In this case the problem was the path variable being passed to the method ... I am trying to compare UIBezierPath

passed to paths in RainbowView

but RainbowView

.

I could try to create curves instead of paths. In this case, there may not be a filled part of the shape, and the area of ​​contact is limited by a stroke. But then how can I recognize tangency on a curve?

I am so confused about all these things !!! : D