UITapGestureRecognizer not doing anything

I've got an app that displays a page of text with the ability to tap a button or swipe in a view to advance or retreat through various pages. The container view has two UISwipeGestureRecognizers attached, for swipe left and swipe right. No trouble with these gestures. But now I'm trying to add UITapGestureRecognizer to another view, providing an ability simil开发者_开发知识库ar to iBooks or the Kindle app, tap the left to go back, the right to go forward. Nothing I do can get the gesture to fire. No hint that it is ever being triggered, even if I put the gesture on my topmost view and disable other gestures.

The view controller implements UIGestureRecognizerDelegate, though I've not needed to implement delegate methods. I did try implementing shouldReceiveTouch: without success.

Here's a snippet of code where I create and attach the gesture recognizer:

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureTurnPage:)];
[self.view addGestureRecognizer:recognizer];
[recognizer release];

Try this on the view you're adding the gesture recognizers:

view.userInteractionEnabled = YES;

You mention that you've tried this, but just in case go through it again.

Try using the delegate with <UIGestureRecognizerDelegate> in the header and then setting the delegate:

UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapGestureTurnPage:)];
[self.view addGestureRecognizer:recognizer];
recognizer.delegate = self;
[recognizer release];

Then implement this method:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer 
       shouldReceiveTouch:(UITouch *)touch {
    return YES;
}

Then use a debugger or toss an NSLog into the above method and also tapGestureTurnPage: to see if these methods are being called.

Add this where you initialize the gesture:

recognizer.delegate = self;

and add this in the "self" class:

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

This allows me to have gestures recognized on the UIWebView, and the UIWebView will still respond to the taps. (which i wanted - you may not)