使用drawRect为UIButton的标签加下划线

时间:2012-06-26 19:48:09

标签: iphone objective-c ios uibutton drawrect

我正在尝试在UIButton中标记标签的文字。但它对我不起作用。 我在viewDidLoad方法中的代码:

    CGFloat x = 13.0f;
CGFloat y = 15.0f;
if (self.numberOfFirstButton == 0) {
    self.numberOfFirstButton = 1;
}
for (NSUInteger i = 1; i <= 5; i++) {

    for (NSUInteger j = 0; j < 10; j++) {
        UIHouseButtons *button = [[UIHouseButtons alloc] init];
        [button setFrame:CGRectMake(x+(47*j), y, 30.0f, 30.0f)];
        [button setTitle:[NSString stringWithFormat:@"%i", self.numberOfFirstButton] forState:UIControlStateNormal];
        [button drawRect:CGRectMake(x+(47*j), y, 30.0f, 30.0f)];
        [self.view addSubview:button];
        self.numberOfFirstButton++;
    }
    y += 48.0f;
}

我的drawRect方法

- (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);
[super drawRect:rect];
}

我的所有按钮都在视图中,但标签的文字没有下划线。我做错了什么?

3 个答案:

答案 0 :(得分:2)

我建议使用NSAttributedString标签。有一堆开源项目可以让这很容易。两个主要项目是:

Nimbus' NIAttributedLabel
TTTAttributedLabel

Nimbus示例:

myLabel.underlineStyle = kCTUnderlineStyleSingle;

答案 1 :(得分:2)

您可以从UILabel继承并覆盖drawRect方法:

 - (void)drawRect:(CGRect)rect {

    CGContextRef ctx = UIGraphicsGetCurrentContext();
   CGContextSetRGBStrokeColor(ctx, 207.0f/255.0f, 91.0f/255.0f, 44.0f/255.0f, 1.0f); // RGBA
    CGContextSetLineWidth(ctx, 1.0f);

  CGContextMoveToPoint(ctx, 0, self.bounds.size.height - 1);
   CGContextAddLineToPoint(ctx, self.bounds.size.width, self.bounds.size.height - 1);

  CGContextStrokePath(ctx);

   [super drawRect:rect];  

}

然后在该标签上放置一个客户按钮。

答案 2 :(得分:0)

我已经创建了一个简单的UIButton子类BVUnderlineButton(基于Web上其他地方的其他代码),您可以直接进入项目。

https://github.com/benvium/BVUnderlineButton(麻省理工学院执照)

的Github上