push 之前没有的，pop 有的，

if (SharedAppDelegate.userInfo.userID == focusFansInfo.idNumber) {

        HomeViewController *controller;

        for (NSObject *obj inself.navigationController.viewControllers) {

            if ([obj isKindOfClass:[HomeViewController class]]) {

                 controller = (HomeViewController *)obj;

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

                return;

            }

        }

        controller = [[HomeViewController alloc] init];

        [self.navigationControllerpopToViewController:controller animated:YES];

 

    }