UIButton 中的文本下划线 [英] Underlining text in UIButton

问题描述

谁能建议如何在 UIButton 的标题下划线?我有一个自定义类型的 UIButton，我希望标题带有下划线，但 Interface Builder 没有提供任何选项.

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.

在界面生成器中，当您为按钮选择字体选项时，它提供了选择无、单、双、颜色的选项，但这些选项都没有对按钮上的标题进行任何更改.

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.

任何帮助表示赞赏.

推荐答案

UIUnderlinedButton.h

UIUnderlinedButton.h

@interface UIUnderlinedButton : UIButton {

}


+ (UIUnderlinedButton*) underlinedButton;
@end

UIUnderlinedButton.m

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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