iPhone xs max 上一像素线闪动

1 像素线的标准做法，但是在 iphone xs max 上闪动，有人遇到过吗？

代码如下：

#define SINGLE_LINE_WIDTH           (1 / [UIScreen mainScreen].scale)
#define SINGLE_LINE_ADJUST_OFFSET   ((1 / [UIScreen mainScreen].scale) / 2)


UIView *cellHeadLine = [[UIView alloc] initWithFrame:CGRectMake(cell.bounds.origin.x, cell.bounds.origin.y - SINGLE_LINE_ADJUST_OFFSET, cell.bounds.size.width, SINGLE_LINE_WIDTH)];
        cellHeadLine.backgroundColor = [UIColor colorGreyBorder];
        [cell addSubview:cellHeadLine];