UILabel和UIButton添加下划线

布满荆棘的人生 2022-07-10 04:18 242阅读 0赞

原文  [http://www.cnblogs.com/xiaofeixiang/p/4582292.html][http_www.cnblogs.com_xiaofeixiang_p_4582292.html]

关于UILabel和UIButton有的时候需要添加下划线，一般有两种方式通过默认的 NSMutableAttributedString设置，第二种就是在drawRect中画一条下划线，本文就简单的选择第一种，第二种有兴趣的可以自己研究一下。

UILabel设置下划线:

UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(10, 100, 310, 50)];
        label.backgroundColor = [UIColor redColor];
        [label setLineBreakMode:NSLineBreakByWordWrapping];
        label.numberOfLines =3;
        [label setFont:[UIFont systemFontOfSize:14]];
        NSMutableAttributedString *content = [[NSMutableAttributedString alloc]initWithString:[NSString stringWithFormat:@"博文地址:http://www.cnblogs.com/xiaofeixiang 博客园-FlyElephant QQ群:228407086"]];
        NSRange contentRange = {0,[content length]};
        [content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];
    
     label.attributedText = content;
    [self.view addSubview:label];</pre><br>
     
    
     UIButton设置下划线: UIButton *button=[[UIButton alloc]initWithFrame:CGRectMake(10, 200, 80, 30)]; 
    
        NSMutableAttributedString *title = [[NSMutableAttributedString alloc] initWithString:@"FlyElephant"]; 
    
        NSRange titleRange = {0,[title length]}; 
    
        [title addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:titleRange]; 
    
        [button setAttributedTitle:title 
    
                          forState:UIControlStateNormal]; 
    
        [button setBackgroundColor:[UIColor redColor]]; 
    
        [button.titleLabel setFont:[UIFont systemFontOfSize:14]]; 
    
        [self.view addSubview:button]; 
     
    
     最终效果如下: 
    
      
    
                 </article>

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