IOS 拦截所有push进来的子控制器

/**
 *  能拦截所有push进来的子控制器
 */
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.viewControllers.count > 0) { // 如果现在push的不是栈底控制器(最先push进来的那个控制器)
        viewController.hidesBottomBarWhenPushed = YES;
        
        // 设置导航栏按钮
        viewController.navigationItem.leftBarButtonItem = [UIBarButtonItem itemWithImageName:@"navigationbar_back" highImageName:@"navigationbar_back_highlighted" target:self action:@selector(back)];
        viewController.navigationItem.rightBarButtonItem = [UIBarButtonItem itemWithImageName:@"navigationbar_more" highImageName:@"navigationbar_more_highlighted" target:self action:@selector(more)];
    }
    [super pushViewController:viewController animated:animated];
}

- (void)back
{
#warning 这里用的是self, 因为self就是当前正在使用的导航控制器
    [self popViewControllerAnimated:YES];
}

- (void)more
{
    [self popToRootViewControllerAnimated:YES];
}
@end