title: UISwipeGestureRecognizer not working
body: <p>I have a UIView inside of a UIScrollView, both created using IB. The UIView scrolls horizontally inside the UIScrollView. I want to detect left and right 2 finger swipes. </p>
  
  <p>Borrowing from the sample code I found in  <a href="http://developer.apple.com/library/ios/#samplecode/SimpleGestureRecognizers/Introduction/Intro.html%23//apple_ref/doc/uid/DTS40009460" rel="nofollow">SmpleGestureRecognizers</a>, I have put the following code in the viewDidLoad method of the UIScrollView's ViewController...</p>
  
  <pre><code>UIGestureRecognizer *recognizer;
  UISwipeGestureRecognizer *swipeRightRecognizer, *swipeLeftRecognizer;
  
  recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
  swipeRightRecognizer = (UISwipeGestureRecognizer *)recognizer;
  swipeRightRecognizer.numberOfTouchesRequired = 2;
  [self.view addGestureRecognizer:swipeRightRecognizer];
  [recognizer release];
  
  recognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(handleSwipeFrom:)];
  swipeLeftRecognizer = (UISwipeGestureRecognizer *)recognizer;
  swipeLeftRecognizer.numberOfTouchesRequired = 2;
  swipeLeftRecognizer.direction = UISwipeGestureRecognizerDirectionLeft;
  [self.view addGestureRecognizer:swipeLeftRecognizer];
  [recognizer release];
  </code></pre>
  
  <p>I have  set in the viewcontroller.h. and have the following delegate method...</p>
  
  <pre><code>- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
     return YES;
  }
  </code></pre>
  
  <p>I am assuming this is a valid gestureRecognizer delegate method, but I cannot find any reference to it in the documentation.</p>
  
  <p>I do not get any errors but nothing happens when I do a 2 finger swipe. The delegate method is not called and neither is my action method. I tried removing the numbeOfTouchesRequired call to see if it might work with a single finger swipe to no avail.</p>
  
  <p>Am I adding the gestureRecognizers to the right view? I tried adding it to the UIView, the UIScrollView as well as self.view.superView. </p>
  
  <p>The sample code runs great. The only difference I can see between my implementation of the code and the sample code is the fact that I used IB to create the views and the sample code did not. I suspect that something is consuming the swipe gesture before it gets to my recognizers.</p>
  
  <p>What am I doing wrong.</p>
  
  <p>Thanks,</p>
  
  <p>John</p>