iOS 10.3之后Label设置删除线无效

在做商品信息展示的时候，通常会需要用到删除线，下面介绍下苹果NSAttributedString自带的删除线属性

通常用法：

    NSString *oldPrice = @"¥ 12345";    NSUInteger length = [oldPrice length];    NSMutableAttributedString*attributedString = [[NSMutableAttributedString alloc]initWithString:oldPrice];    [attributedString addAttribute:NSForegroundColorAttributeName value:RGBACOLOR(253, 91, 120, 1) range:NSMakeRange(0, length)];    [attributedString addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid|NSUnderlineStyleSingle) range:NSMakeRange(0, length)];    [attributedString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:14] range:NSMakeRange(0, length)];    [attributedString addAttribute:NSForegroundColorAttributeName value:[UIColor lightGrayColor] range:NSMakeRange(0, length)];    [priceLabel setAttributedText:attributedString];

但用了之后发现，删除线在iOS系统10.3以上的手机上消失了。。。查资料发现原来是iOS 10.3中NSStrikethroughStyleAttributeName(任何NSUnderlineStyle情况)都不再起作用，需要换一种写法：

NSMutableAttributedString *attrStr = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"¥ 12345"]];    [attrStr addAttributes:@{NSStrikethroughStyleAttributeName:@(NSUnderlineStyleSingle),NSBaselineOffsetAttributeName:@(0)} range:NSMakeRange(0, attrStr.length)];    [self.oldMoneyLab setAttributedText:attrStr];