iOS如何pop到指定页面

    [self.navigationController popToRootViewControllerAnimated:YES];

for (UIViewController *controller in self.navigationController.viewControllers) {
        if ([controller isKindOfClass:[AViewController class]]) {
            AViewController *A =(AViewController *)controller;
                 [self.navigationController popToViewController:A animated:YES];
        }
    }