蛋疼的代码，

  case 3:

        {

                       

            MedicineViewController *controller = [[MedicineViewControlleralloc] initWithNibName:@"MedicineViewController"bundle:nil];

            [self.navigationController pushViewController:controller animated:YES];

            [self performSelector:@selector(pushViewController:) withObject:controller afterDelay:.2f];

            

            break;

        }