Add and Remove ChildViewController

gistfile1.m

// add child view
    UIViewController* controller = [self.storyboard instantiateViewControllerWithIdentifier:@"test"];
    [self addChildViewController:controller];
    controller.view.frame = CGRectMake(0, 44, 320, 320);
    [self.view addSubview:controller.view];
    [controller didMoveToParentViewController:self];

// remove child view
    UIViewController *vc = [self.childViewControllers lastObject];
    [vc.view removeFromSuperview];
    [vc removeFromParentViewController];

vc.view.removeFromSuperview()*

I applied the solution but what to do if i want to add a childViewController that's embedded in a navigation controller (the navigation bar won't appear !!).
and thanks in advance.

Thanks a lot. It works like a charm