Instead of push segue how to replace view controller (or remove from navigation stack)?

Question

I have a small iPhone app, which uses a navigation controller to display 3 views (here fullscreen):

Answer 1

You could use a custom segue: to do it you need to create a class subclassing UIStoryboardSegue (example MyCustomSegue), and then you can override the "perform" with something like this

-(void)perform {
    UIViewController *sourceViewController = (UIViewController*)[self sourceViewController];
    UIViewController *destinationController = (UIViewController*)[self destinationViewController];
    UINavigationController *navigationController = sourceViewController.navigationController;
    // Pop to root view controller (not animated) before pushing
    [navigationController popToRootViewControllerAnimated:NO];
    [navigationController pushViewController:destinationController animated:YES];    
}

At this point go to Interface Builder, select "custom" segue, and put the name of your class (example MyCustomSegue)