当页面隐藏navigationBar[self.navigationController setNavigationBarHidden:YES];
期望整个view填充window的时候，会发现存在scrollView的情况下，顶部会自动留出stateView高度的距离。例如，下方是tableView的情况：

scrollViewInsets.png

总的解决方案：

if (@available(iOS 11.0, *)) {
        self.tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
    }else {
        self.automaticallyAdjustsScrollViewInsets = NO;
    }

也有另一种解决思路，就是在顶部增加一个view（非scrollView），下方的scrollView不会自动留出空隙

view填充顶部.png

问题：手势左滑返回上一级，navigationBar出现异常

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES ];
}
- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO ];
}

具体表示：

navigationBar异常.gif

改为

- (void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    [self.navigationController setNavigationBarHidden:YES animated:YES];
}
- (void)viewWillDisappear:(BOOL)animated
{
    [super viewWillDisappear:animated];
    [self.navigationController setNavigationBarHidden:NO animated:YES];
}

navigationBar正常.gif