UILabel中文本的像素宽度 [英] Pixel Width of the text in a UILabel

问题描述

我需要绘制一个UILabel。因此，我将UILabel子类化并按如下方式实现：

I need to draw a UILabel striked through. Therefore I subclassed UILabel and implemented it as follows:

@implementation UIStrikedLabel

- (void)drawTextInRect:(CGRect)rect{
    [super drawTextInRect:rect];

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextFillRect(context,CGRectMake(0,rect.size.height/2,rect.size.width,1));
}
@end

UILabel被击穿后会发生什么一条线与整个标签一样长，但文字可以更短。
有没有办法确定文本的长度（以像素为单位），以便可以适当地绘制线条？

What happens is that the the UILabel is striked through with a line being as long as the whole label, but the text can be shorter. Is there a way to determine the length of the text in pixels, such that the line can appropriately be drawn?

我也对任何其他人开放解决方案，如果已知：）

I'm also open to any other solutions, if known :)

最好，
Erik

Best, Erik

推荐答案

NSString有 sizeWithAttributes：可用于此的方法。它返回一个CGSize结构，因此您可以执行与以下内容类似的操作来查找标签内文本的宽度。

NSString has a sizeWithAttributes: method that can be used for this. It returns a CGSize structure, so you could do something similar to the following to find the width of the text inside your label.

CGSize textSize = [[label text] sizeWithAttributes:@{NSFontAttributeName:[label font]}];

CGFloat strikeWidth = textSize.width;

iOS< 7

之前iOS7，您必须使用 sizeWithFont： method。

CGSize textSize = [[label text] sizeWithFont:[label font]];

CGFloat strikeWidth = textSize.width;

UILabel有一个字体属性，可用于动态获取标签的字体详细信息，因为我'我正在做。

UILabel has a font property that you can use to dynamically get the font details for your label as i'm doing above.

希望这会有所帮助：）

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