gestureRecognizer

UITapGestureRecognizer* singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
[self.view addGestureRecognizer:singleTap];　//这个可以加到任何控件上,比如你只想响应WebView，我正好填满整个屏幕
singleTap.delegate = self;
singleTap.cancelsTouchesInView = NO;
[singleTap release];

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

如果没有将自己赋值给UITapGestureRecognizer的委托，那么gestureRecognizer就不会被执行