NSMutableAttributedString 富文本框 设置下划线

NSString *priceString = [NSString
stringWithFormat:@"原价:%@万", myModel.price];
    NSMutableAttributedString *attributedString1 = [self
setLabelAttriButeString:priceString
andModelLength:myModel.price2.length];
    [attributedString1 addAttribute:NSStrikethroughStyleAttributeName
value:[NSNumber
numberWithInteger:NSUnderlinePatternSolid |
NSUnderlineStyleSingle] range:NSMakeRange(0, priceString.length)];

- (NSMutableAttributedString *)setLabelAttriButeString:(NSString *)text andModelLength:(NSInteger)modelLength
{
    NSMutableAttributedString *attributedString = [[NSMutableAttributedString
alloc] initWithString:text];
    [attributedString addAttribute:NSForegroundColorAttributeName
value:[UIColor
orangeColor] range:NSMakeRange(3, modelLength)];

   
    return attributedString;
}