给button增加下划线

如何给button增加下划线简单版

p.p1 { margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Menlo; color: #000000; background-color: #fffcea }
p.p2 { margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Menlo; color: #cf8724; background-color: #fffcea }
p.p3 { margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Menlo; color: #c35900; background-color: #fffcea }
p.p4 { margin: 0.0px 0.0px 0.0px 0.0px; font: 13.0px Menlo; color: #587ea8; background-color: #fffcea }
span.s1 { color: #36568a }
span.s2 { color: #c35900 }
span.s3 { color: #000000 }
span.s4 { color: #587ea8 }

- (void)setUnderLineForButton:(UIButton *)btn withTitle:(NSString *)title{

//利用富文本的方式增加button下划线

NSMutableAttributedString *str = [[NSMutableAttributedString alloc]initWithString:title];

NSRange strRange = {0,[str length]};

[str addAttribute:NSUnderlineStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlineStyleSingle] range:strRange];

[btn setAttributedTitle:str forState:UIControlStateNormal];

}

原文地址：https://www.cnblogs.com/lsnow/p/9889471.html