摘自:http://blog.sina.com.cn/s/blog_6cd380c10101b6hn.html
//带下划线的“注” NSMutableAttributedString可变的属性字符串,添加下划线属性
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 100, 300, 100)];
label.backgroundColor = [UIColor redColor];
label.numberOfLines = 3;
label.adjustsFontSizeToFitWidth = YES;
NSMutableAttributedString *content = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"
@"注:本工具测试结果为一周内平均每天盐的摄入量;问题中涉及的食物均以一人份为准;本软件更适用于成人;建议您及您的家人使用低钠盐"
"]];
NSRange contentRange = {0,[content length]};
[content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];
label.attributedText = content;
[self.view addSubview:label];