Navigation bar disappear issue

[girubhai]

Hi,As given in sample code,to navigate another view controller there is code as
case LeftMenuSwift: [self.slideMenuController changeMainViewController:self.swiftViewController close:YES]; break;
and the SwiftViewController defined as

UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:nil]; SwiftViewController *swiftViewController = (SwiftViewController *)[storyboard instantiateViewControllerWithIdentifier:@"SwiftViewController"]; self.swiftViewController = [[UINavigationController alloc] initWithRootViewController: swiftViewController];

In above line you did set initWithRootViewController to UINavigationController but what to do if I use navigation controller already in stroyboard.
To be more precise,when I used
vpViewController = [[UINavigationController alloc] initWithRootViewController: vpViewController];
then it gives error that invalid pointer type assigning to vpViewController from UINavigationController
And when I remove this line,then it works but navigation bar disappeared.