iOS14 pop时tabbar不显示的问题

项目在iOS14上运行出现了一个问题，A->B->C，接着在C界面pop回A，tabbar居然消失了。
解决方案：

- (NSArray<__kindof UIViewController *> *)popToRootViewControllerAnimated:(BOOL)animated{
    if (self.viewControllers.count > 0 ) {
        UIViewController *popController = self.viewControllers.lastObject;
        if ([popController isKindOfClass:[CustomCViewController class]]) {
            popController.hidesBottomBarWhenPushed = NO;
        }
    }
    return [super popToRootViewControllerAnimated:animated];

}

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