/* On the pushed UIViewController */
- (void)viewWillAppear:(BOOL)animated {
    
    [self.navigationController setNavigationBarHidden:YES
                                             animated:animated];
    
    [super viewWillAppear:animated];
}

- (void)viewWillDisappear:(BOOL)animated {
    
    [self.navigationController setNavigationBarHidden:NO
                                             animated:animated];
    
    [super viewWillDisappear:animated];
}