title: Apple pencil tap gesture recognizing problem
body: <p>I have implemented the <code>UIPencilInteractionDelegate</code> to detect apple pencil double tap as follows.</p>
  
  <pre><code>UIPencilInteraction *pencilInteraction = [[UIPencilInteraction alloc] init];
  pencilInteraction.delegate = self;
  [self.view addInteraction:pencilInteraction];
  </code></pre>
  
  <p>delegate method implementation</p>
  
  <pre><code>- (void)pencilInteractionDidTap:(UIPencilInteraction *)interaction{
      NSLog(@"Detected");
  }
  </code></pre>
  
  <p>However cannot detect the double tap gesture with above implementation. What will be the mistake?</p>