title: disable ccTouche
body: <p>i am setting touch enable in my layer with :</p>
  
  <pre><code>[[[CCDirector sharedDirector]touchDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:YES];
  </code></pre>
  
  <p>later if i want to disable touch with :  <code>self.isTouchEnabled=NO;</code> its not working .
  if i am trying to disable it with :</p>
  
  <pre><code>[[[CCDirector sharedDirector]touchDispatcher] addTargetedDelegate:self priority:0 swallowsTouches:NO];
  </code></pre>
  
  <p>its ok , but then if i enable it again with the <strong>same syntax</strong> i get crash that the delegate was already added ...</p>
  
  <p>how one can disable and enable touches dynamically ??</p>
  
  <p>thanks .</p>