popToViewController返回到指定页面

ZNWNeedsRegistrationDetailViewController *registrationDetailVC = [[ZNWNeedsRegistrationDetailViewController alloc] init];        EditPersonInFoViewController *editPersonInFoVC = [[EditPersonInFoViewController alloc] init];        UIViewController *target = nil;for (UIViewController * controller in self.navigationController.viewControllers) {            if ([controller isKindOfClass:[registrationDetailVC class]]) {                target = controller;            }else if ([controller isKindOfClass:[editPersonInFoVC class]]) {                target = controller;            }        }if (target) {            [self.navigationController popToViewController:target animated:YES];        }