给UILabel 或者 UIButton标题加下划线

方法一：
[objc] view plaincopyprint?

NSMutableAttributedString *str = [[NSMutableAttributedString alloc] initWithString:@"查看所有中奖记录"];

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

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

[_awardDisplayBtn setAttributedTitle:str forState:UIControlStateNormal];

方法二：

HyperlinksButton.h
[objc] view plaincopyprint?

#import <UIKit/UIKit.h>

@interface HyperlinksButton : UIButton

{

UIColor *lineColor;

}

-(void)setColor:(UIColor*)color;

@end

HyperlinksButton.m
[objc] view plaincopyprint?

#import "HyperlinksButton.h"

@implementation HyperlinksButton

- (id)initWithFrame:(CGRect)frame

{

self = [super initWithFrame:frame];

if (self) {

}

return self;

}

-(void)setColor:(UIColor *)color{

lineColor = [color copy];

[self setNeedsDisplay];

}

- (void) drawRect:(CGRect)rect {

CGRect textRect = self.titleLabel.frame;

CGContextRef contextRef = UIGraphicsGetCurrentContext();

CGFloat descender = self.titleLabel.font.descender;

if([lineColor isKindOfClass:[UIColor class]]){

CGContextSetStrokeColorWithColor(contextRef, lineColor.CGColor);

}

CGContextMoveToPoint(contextRef, textRect.origin.x, textRect.origin.y + textRect.size.height + descender+1);

CGContextAddLineToPoint(contextRef, textRect.origin.x + textRect.size.width, textRect.origin.y + textRect.size.height + descender+1);

CGContextClosePath(contextRef);

CGContextDrawPath(contextRef, kCGPathStroke);

}

@end

直接将这个类 copy 到工程中，，然后将需要加下划线的 Button 类名改为 HyperlinksButton就可以了，提供了 setColor: 这个接口，可以设置下划线颜色，代码很简单，不解释了。UILabel 同理可得。