gistfile1.m

    NSMutableArray *locations = [app.destLang locationsForCategoryId:category.id];
    if (locationsViewController == nil) {
      locationsViewController = [[LocationsViewController alloc] initWithNibName:@"LocationsView" bundle:nil];
    }
    locationsViewController.title = category.name;
    locationsViewController.categoryId = category.id;
    [[self navigationController] pushViewController:locationsViewController animated:YES];
    locationsViewController.locations = locations;