iOS CFStringTransform和Đ [英] iOS CFStringTransform and Đ

问题描述

我正在开发一个iOS应用程序，我必须在其中列出并对人名进行排序。我有一些特殊问题的问题。

I'm working on an iOS app in which I have to list and sort people names. I've some problem with special character.

我需要对Martin R回答 https://stackoverflow.com/a/15154823/2148377

I need some clarification on Martin R answer on https://stackoverflow.com/a/15154823/2148377

您可以使用CoreFoundation CFStringTransform函数从列表中进行几乎所有转换。只有đ和Đ必须单独处理：

You could use the CoreFoundation CFStringTransform function which does almost all transformations from your list. Only "đ" and "Đ" have to be handled separately:

为什么这封信？这来自哪里？我在哪里可以找到文档？

Why this particular letter? Where does this come from? Where can I find the documentation?

非常感谢。

推荐答案

我不是百分百肯定，但我认为可以从Unicode数据库中看到
http://www.unicode.org/Public/6.2.0/ucd/UnicodeData.txt 。

I am not 100% sure, but I think it can be seen from the Unicode Data Base http://www.unicode.org/Public/6.2.0/ucd/UnicodeData.txt.

例如，à的条目是

00E0;LATIN SMALL LETTER A WITH GRAVE;Ll;0;L;0061 0300;;;;N;LATIN SMALL LETTER A GRAVE;;00C0;;00C0

其中字段＃6是分解映射到a + U + 0300（COMBINING GRAVE ACCENT），
因此

where field #6 is the "Decomposition mapping" into "a" + U+0300 (COMBINING GRAVE ACCENT), therefore

CFStringTransform(..., kCFStringTransformStripCombiningMarks, ...)

将à转换为a。

Đ和đ的条目是

0110;LATIN CAPITAL LETTER D WITH STROKE;Lu;0;L;;;;;N;LATIN CAPITAL LETTER D BAR;;;0111;
0111;LATIN SMALL LETTER D WITH STROKE;Ll;0;L;;;;;N;LATIN SMALL LETTER D BAR;;0110;;0110

其中字段＃6为空，因此这些字符没有分解为基本字符和组合标记。

where field #6 is empty, so these characters do not have a decomposition into a "base character" and a "combining mark".

所以问题仍然存在：哪个标准确定đ/Đ的标准化形式是d / D？

So the question remains: Which standard determines that a "normalized form" of "đ / Đ" is "d / D"?

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