在UIButton中加下划线的文字 [英] Underlining text in UIButton

问题描述

任何人都可以建议如何强调一个UIButton的标题？我有一个自定义类型的UIButton，我希望标题被加下划线，但Interface Builder不提供任何选项。

在Interface Builder中，当你选择一个按钮的字体选项，它提供选项来选择None，Single，Double，Color，但是这些都没有提供按钮上的标题的任何改变。

任何帮助表示赞赏。

解决方案

：

UIUnderlinedButton.h

  @interface UIUnderlinedButton：UIButton {
 
} 
 
 
 +（UIUnderlinedButton *）underlinedButton; 
 @end 
  

UIUnderlinedButton.m

  @implementation UIUnderlinedButton 
 
 +（UIUnderlinedButton *）underlinedButton {
 UIUnderlinedButton * button = [[UIUnderlinedButton alloc] init]; 
 return [button autorelease]; 
 
 
  - （void）drawRect：（CGRect）rect {
 CGRect textRect = self.titleLabel.frame; 
 
 //需要将行放在descenders的顶部（负值）
 CGFloat descender = self.titleLabel.font.descender; 
 
 CGContextRef contextRef = UIGraphicsGetCurrentContext（）; 
 
 //设置为与文本相同的颜色
 CGContextSetStrokeColorWithColor（contextRef，self.titleLabel.textColor.CGColor）; 
 
 CGContextMoveToPoint（contextRef，textRect.origin.x，textRect.origin.y + textRect.size.height + descender）; 
 
 CGContextAddLineToPoint（contextRef，textRect.origin.x + textRect.size.width，textRect.origin.y + textRect.size.height + descender）; 
 
 CGContextClosePath（contextRef）; 
 
 CGContextDrawPath（contextRef，kCGPathStroke）; 
} 
 
 
 @end 
  

Can anyone suggest how to underline the title of a UIButton ? I have a UIButton of Custom type, and I want the Title to be underlined, but the Interface Builder does not provide any option to do so.

In Interface Builder when you select the Font Option for a Button, it provides option to select None, Single, Double, Color but none of these provide any changes to the Title on the Button.

Any help appreciated.

解决方案

just needed to do this myself:

UIUnderlinedButton.h

@interface UIUnderlinedButton : UIButton {

}


+ (UIUnderlinedButton*) underlinedButton;
@end

UIUnderlinedButton.m

@implementation UIUnderlinedButton

+ (UIUnderlinedButton*) underlinedButton {
    UIUnderlinedButton* button = [[UIUnderlinedButton alloc] init];
    return [button autorelease];
}

- (void) drawRect:(CGRect)rect {
    CGRect textRect = self.titleLabel.frame;

    // need to put the line at top of descenders (negative value)
    CGFloat descender = self.titleLabel.font.descender;

    CGContextRef contextRef = UIGraphicsGetCurrentContext();

    // set to same colour as text
    CGContextSetStrokeColorWithColor(contextRef, self.titleLabel.textColor.CGColor);

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

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

    CGContextClosePath(contextRef);

    CGContextDrawPath(contextRef, kCGPathStroke);
}


@end

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