iOS pushViewController is not working

Question

I have a navigation controller, a view controller, and a table view that were all created in my storyboard:

When you touch a certain row in the table view, it SHOULD push a new controller onto the navigation controller, but instead nothing happens. Here is the code:

- (void) tableView: (UITableView *) tableView didSelectRowAtIndexPath: (NSIndexPath *) indexPath {
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:@"Main" bundle: nil];

UINavigationController *controller = (UINavigationController*)[mainStoryboard
                                                               instantiateViewControllerWithIdentifier: @"dbNav"];

SubLevelViewController *slController = [[SubLevelViewController alloc] initWithStyle:UITableViewStylePlain];
[controller pushViewController: slController animated: YES];
}

Answer 1

Try

- (void) tableView: (UITableView *) tableView didSelectRowAtIndexPath: (NSIndexPath *) indexPath {

    UINavigationController *controller  = self.navigationController;

    SubLevelViewController *slController = [[SubLevelViewController alloc] initWithStyle:UITableViewStylePlain];
    [controller pushViewController: slController animated: YES];
 }

Basically instantiateViewControllerWithIdentifier creates a new instance of the specified view controller each time you call it, so you are pushing the view in a different Navigation controller than the one that is displayed