给 UIButton、UILabel添加下划线

1.给UIButton添加下划线

        UIButton *button = [[UIButtonalloc]initWithFrame:CGRectMake(0,0, KScreenWidth,25)];

        [button setTitleColor:[UIColorblackColor] forState:UIControlStateNormal];

        [button setBackgroundColor:[UIColorcolorWithRed:239.0/255.0green:152.0/255.0blue:121.0/255.0alpha:1]];

        [button.titleLabel setFont:[UIFont systemFontOfSize:10]];

        NSMutableAttributedString *title = [[NSMutableAttributedStringalloc] initWithString:@"号源紧俏经常预约不上？试试预约抢号功能？ >>"];

        NSRange titleRange = {0, [titlelength]};

        [title addAttribute:NSUnderlineStyleAttributeNamevalue:[NSNumbernumberWithInteger:NSUnderlineStyleSingle]range:titleRange];

        [button setAttributedTitle:titleforState:UIControlStateNormal];

        [button addTarget:selfaction:@selector(buttonAction:)forControlEvents:UIControlEventTouchUpInside];

[self.view addSubview:button];

2.给UILabel添加下划线

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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:@"123213213213232"]];     NSRange contentRange = {0,[content length]};     [content addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:contentRange];           label.attributedText = content;     [self.view addSubview:label];

或者也可以用RTLabel  至于怎么用 之后会持续更新