返回根页面vc用 ：

[self.navigationController popToRootViewControllerAnimated:NO];

返回指定的某个vc用下面（通过index定位）：

[self.navigationController popToViewController [self.navigationController.viewControllers objectAtIndex:2] animated:YES];

或（通过class定位）：

for (UIViewController *controller in self.navigationController.viewControllers) {

      if ([controller isKindOfClass:[你要跳转到的Controller class]]) {

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

      }

}