iPhone上的CoreText和删除线 [英] CoreText and strikethrough on iPhone

问题描述

我目前正在努力在许多UITableViewCell中显示删除线文本.用HTML编写的内容看起来像

I'm currently struggling with the need to display strikethrough text in many UITableViewCells. Something that written in HTML would looke like

<strike>€99</strike> save 50% => now €49

我不想只将UIWebView用于一行文本，特别是在小的UITableViewCell中使用它.我知道有可重用的单元格以及所有单元格，但是我想让事情尽可能以更节省内存的方式进行.

I don't want to use a UIWebView just for a single line of text, especially that it's used in small UITableViewCells. I know there are reusable cells and all, but I'd like to keep things the more memory-efficient way possible.

所以...在AliSoftware的UILabel-替换OHAttributedLabel的帮助下，我正在使用NSAttributedString.仅从iOS 4.0开始才可用的事实没有问题，因为我们仅使用与4.0兼容的所有内容.

So... I'm using NSAttributedStrings, with the help of AliSoftware's UILabel-replacement OHAttributedLabel. The fact that it's only available starting with iOS 4.0 is no problem, as we use all kinds of stuff only 4.0-compatible.

我可以设法创建属性字符串，它在OHAttributedLabel中显示文本，确定，很酷.但是我无法实现的是设置"strikeout"或"strikethrough"属性.

I can manage to create the attributed string, it displays text in the OHAttributedLabel, OK, that's cool. But what I can't achieve is setting the "strikeout", or "strikethrough" attribute.

基本上我是这样的:

NSString *price = [NSString stringWithFormat:@"%01.2f €", product.price];
NSString *rate = [NSString stringWithFormat:@" -%01.0f%%", product.reductionRate];

NSMutableAttributedString *s = [NSMutableAttributedString attributedStringWithString:price];

[s addAttribute:NSStrikethroughStyleAttributeName value:[NSNumber numberWithInteger:NSUnderlinePatternSolid | NSUnderlineStyleSingle] range:NSRangeFromString(price)];
[attributedLabel setAttributedText:s];

但是在这里，三个NS*常量是未定义的.我已导入CoreText.h，Foundation/NSAttributedString.h，但无济于事.我在网路上看到 NSStrikethroughStyleAttributeName = @"NSStrikethroughStyleAttributeName"以及NSUnderlinePatternSolid = 0和NSUnderlineStyleSingle = 1，但是对这些值进行硬编码不会产生任何结果. 我用自动补全得到的一件事是等效的kCT...*常量，但是有kCTUnderlineStyleAttributeName，kCTStrokeWidthAttributeName，...，但是没有提到kCTStrikethrough _anything.

But here, the three NS* constants are undefined. I've imported CoreText.h, Foundation/NSAttributedString.h, to no avail. I've seen somewhere on the web that NSStrikethroughStyleAttributeName = @"NSStrikethroughStyleAttributeName", and that NSUnderlinePatternSolid = 0 and NSUnderlineStyleSingle = 1, but hard-coding these values don't give anything. One thing I got with auto-completion are the equivalent kCT...* constants, but there are kCTUnderlineStyleAttributeName, kCTStrokeWidthAttributeName, ... but no mention of kCTStrikethrough_anything.

我应该怎么显示* $ |#！@删除线文本?

What should I do to display that *$|#!@ piece of strike-through text ?

推荐答案

在iOS 6中，您可以使用NSStrikethroughStyleAttributeName

With iOS 6 you can use NSStrikethroughStyleAttributeName

[attributedString addAttribute:NSStrikethroughStyleAttributeName value:[NSNumber numberWithInt:NSUnderlineStyleSingle] range:selectedRange];

虽然看起来不合适，但numberWithInt值正确为NSUnderlineStyleSingle.

While it may seem out of place, the numberWithInt value is correct as NSUnderlineStyleSingle.

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