Label 删除线

NSUInteger length = [self.marketPriceLabel.text length];
NSMutableAttributedString *attri = [[NSMutableAttributedString alloc] initWithString:self.marketPriceLabel.text];
[attri addAttribute:NSStrikethroughStyleAttributeName value:@(NSUnderlinePatternSolid | NSUnderlineStyleSingle) range:NSMakeRange(0, length)];
[attri addAttribute:NSStrikethroughColorAttributeName value:[UIColor colorWithHexString:@"#999999"] range:NSMakeRange(0, length)];
[self.marketPriceLabel setAttributedText:attri];