富文本的修改

NSString *string2 =  [NSString stringWithFormat:@"朋友价 ￥%@",model.boss_sell_price];
    NSMutableAttributedString *string1 = [[NSMutableAttributedString alloc] initWithString:string2];
    [string1 addAttribute:NSFontAttributeName
                    value:[UIFont systemFontOfSize:8]
                    range:NSMakeRange(4, 1)];
    [string1 addAttribute:NSForegroundColorAttributeName
                    value:UIColorFromRGB(0x999999)
                    range:NSMakeRange(0, 4)];
    self.sell.attributedText = string1;