如何防止在使用导航控制器按后退按钮后出现前一个片段？

self.navigationController.interactivePopGestureRecognizer.enabled = NO;

- (UIViewController *)popViewControllerAnimated:(BOOL)animated {
    if ([self.viewControllers.lastObject isKindOfClass:[YourViewController class]]) {
        // 如果当前的视图控制器是指定的视图控制器，则返回到指定的页面
        [self popToViewController:self.viewControllers[2] animated:animated];
        return self.viewControllers[2];
    } else {
        return [super popViewControllerAnimated:animated];
    }
}

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated {
    if ([viewController isKindOfClass:[YourViewController class]]) {
        // 如果即将显示的视图控制器是指定的视图控制器，则将导航栈设置为指定的视图控制器数组
        NSMutableArray *viewControllers = [NSMutableArray arrayWithArray:self.navigationController.viewControllers];
        [viewControllers removeObject:viewController];
        [viewControllers addObject:yourViewController];
        [self.navigationController setViewControllers:viewControllers animated:NO];
    }
}