NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:contentStr];
//设置:在0-3个单位长度内的内容显示成红色
[str addAttribute:NSForegroundColorAttributeName value:RGB(234, 51, 53) range:NSMakeRange(8, 4)];
agreeLabel.attributedText = str;
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