title: Single Tap to MKMapView without breaking double tap zoom
body: <p>I want to drop a pin on my <code>MKMapView</code> when the user single taps on the map. I have the pin code working, I have the single tap working, but when I double tap to zoom I get a single tap first. Here's my code to get the recognizers setup:</p>
  
  <pre><code>    self.doubleTap = [[UITapGestureRecognizer alloc]
                        initWithTarget:self action:@selector(handleDoubleTap:)];
      self.doubleTap.numberOfTapsRequired = 2;
      self.doubleTap.numberOfTouchesRequired = 1;
      [mapView_ addGestureRecognizer:doubleTap_];
  
      self.singleTap = [[UITapGestureRecognizer alloc]
                        initWithTarget:self action:@selector(handleGesture:)];
      self.singleTap.numberOfTapsRequired = 1;
      self.singleTap.numberOfTouchesRequired = 1;
      [self.singleTap requireGestureRecognizerToFail: doubleTap_];
      [mapView_ addGestureRecognizer:singleTap_];
  </code></pre>
  
  <p>Now, this is not surprising, to quote Apple:</p>
  
  <blockquote>
    <p>Note: In the case of the single-tap versus double-tap gestures, if a
    single-tap gesture recognizer doesn’t require the double-tap
    recognizer to fail, you should expect to receive your single-tap
    actions before your double-tap actions, even in the case of a double
    tap. This is expected and desirable behavior because the best user
    experience generally involves stackable actions.</p>
  </blockquote>
  
  <p>So I added <code>requireGestureRecognizerToFail</code> to my single tap recognizer.</p>
  
  <blockquote>
    <p>[singleTap requireGestureRecognizerToFail: doubleTap];</p>
  </blockquote>
  
  <p>and this ensures that my single tap recognizer doesn't get double taps.</p>
  
  <p>But...</p>
  
  <p>Now my double tap recognizer gets the double taps and <code>MKMapView</code> doesn't get them. I've tried setting <code>cancelsTouchesInView</code> to <code>NO</code> in the recognizer, but that didn't help either.</p>
  
  <p>So I need a way to either prevent my single tap recognizer from getting double taps (which seems unlikely) or to get my double tap event to my mapView.</p>