ios UILabel 中部分文字变色

最近做了个评论回复功能，要求用户名变色，找了下方法，总结下

代码部分1

结果部分：

结果部分1

UILabel 中间部分文字改变颜色方法

代码部分2

结果部分：

结果部分2

UILabel *contentStr = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 300, 25)];

    NSString *userName=@"张三";

    NSString *replyUserName=@"李四";

    NSString *content=@"有机会看看了";

    NSString *string = [NSString stringWithFormat:@"%@：%@",userName,content];

    if (replyUserName.length != 0) {

      string = [NSString stringWithFormat:@"%@回复%@：%@",userName,replyUserName,content];

    }

    NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:string];

    [text addAttribute:NSForegroundColorAttributeName value:[UIColor  redColor] range:[string rangeOfString:userName]];

    if (replyUserName.length != 0) {

        [text addAttribute:NSForegroundColorAttributeName value:[UIColor  redColor] range:[string rangeOfString:replyUserName]];

    }

    contentStr.attributedText = text;

    [self.view addSubview:contentStr];

    UILabel *shifuLab = [[UILabel alloc] initWithFrame:CGRectMake(10, 200, 300, 25)];

    NSString *str1 = @"￥";

    long len1 = [str1 length];

    NSString *shuliangStr =[NSString stringWithFormat:@"共计%d件商品",1223423];

    long len2 = [shuliangStr length];

    NSString *str = [NSString stringWithFormat:@"￥%@    实付:%.2f元",shuliangStr,3434.00];

    NSMutableAttributedString *str2 = [[NSMutableAttributedString alloc]initWithString:str];

    [str2 addAttribute:NSForegroundColorAttributeName value:[UIColor  redColor] range:NSMakeRange(len1,len2)];

    [str2 addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:15.0f] range:NSMakeRange(len1,len2)];

    shifuLab.attributedText = str2;

    [self.view addSubview:shifuLab];

UILabel *coverLab = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 300, 25)];

NSString *vipNumber=@"VIP会员";

    NSString *coverStr=[NSString stringWithFormat:@"尊敬的用户，该视频仅限 %@ 观看",vipNumber];

    NSMutableAttributedString *text = [[NSMutableAttributedString alloc] initWithString:coverStr];

    [text addAttribute:NSForegroundColorAttributeName value:[UIColor  greenColor] range:[coverStr rangeOfString:vipNumber]];

    coverLab.attributedText = text;