NSMutableAttributedString *showStr = [[NSMutableAttributedString alloc] initWithString:@"微信搜索V积分就能找到我们"];

    [showStr addAttribute:NSForegroundColorAttributeName value:kUIColorFromRGB(0xed1f24) range:NSMakeRange(4, 3)];

    showLable2.attributedText = showStr;

设置UILable特定的字为特定的颜色