uiscrollview-setcontentoffsetanimated-not-working-in-ios11 评论中找答案
如题：这种情况一般发生在UITableView上，UIScrollView没有类似问题

    _tableView.estimatedRowHeight = 0;// default is UITableViewAutomaticDimension, set to 0 to disable
    _tableView.estimatedSectionHeaderHeight =0;// default is UITableViewAutomaticDimension, set to 0 to disable
    _tableView.estimatedSectionFooterHeight =0; // default is UITableViewAutomaticDimension, set to 0 to disable

设置三种属性即可解决

iOS11 UITableView push 返回后有一个向下的动画

 if #available(iOS 11.0, *) {
        tableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentBehavior.never
    } else {
        // Fallback on earlier versions
    }

if (@available(iOS 11.0, *)) {
      [UIScrollView appearance].contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever;
}