Вот пример.
-(void)handleGesture:(UIGestureRecognizer *)gestureRecognizer
{
CGPoint p = [gestureRecognizer locationInView:self.navigationController.toolbar];
CGRect nextButtonRect = CGRectMake(self.navigationController.toolbar.frame.size.width * 2 / 3,
0,
self.navigationController.toolbar.frame.size.width / 3,
self.navigationController.toolbar.frame.size.height);
CGRect previousButtonRect = CGRectMake(0,
0,
self.navigationController.toolbar.frame.size.width / 3,
self.navigationController.toolbar.frame.size.height);
if (CGRectContainsPoint(previousButtonRect, p))
[self tapOnPreviousNews];
if (CGRectContainsPoint(nextButtonRect, p))
[self tapOnNextNews];
}