gesture recogniser on web view in an iphone app - iphone

Question

I have created a webview to display the pdf, now using the gesture recognizer on single tap I have to call some method but single tap is not recognising
I have used this code
UIWebView *webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 0, 450,450)];
UITapGestureRecognizer *DoubleFingerDTap = [[UITapGestureRecognizer alloc]
initWithTarget:self action:#selector(screenTappedtwice:)];
DoubleFingerDTap.numberOfTapsRequired = 1;
[webView addGestureRecognizer:DoubleFingerDTap];
[DoubleFingerDTap release];
method called
- (void)screenTappedtwice:(UIGestureRecognizer *)sender {
CGPoint tapPoint = [sender locationInView:sender.view.superview];
[UIView beginAnimations:nil context:NULL];
sender.view.center = tapPoint;
//Check the current state of the navigation bar...
//BOOL navBarState = [self.navigationController isNavigationBarHidden];
// Set the navigationBarHidden to the opposite of the current state.
// [self.navigationController setNavigationBarHidden:TRUE animated:YES];
[self.navigationController setNavigationBarHidden:YES animated:YES];
[UIView commitAnimations];
}

Answer 1

Have you tried setting:
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer;
to return YES? Also, ensure you set your tap gesture's delegate to self so that the message is properly received. I just tested this in a new project and it does work.
EDIT
Not quite sure what your animation begin & commit is for - the method setNavigationBarHidden:animated: animates itself. Additionally, the use of these animation definitions are discouraged in iOS 4 onwards - look into using block-based animations on UIView instead.
For your navigation controller, you are pretty much there - implement something like this:
- (void)screenTappedTwice:(UITapGestureRecognizer *)sender
{
BOOL shouldHideNavBar = [self.navigationController isNavigationBarHidden] ? NO : YES;
[self.navigationController setNavigationBarHidden:shouldHideNavBar animated:YES];
}