将NSAttributedString转换为纯文本 [英] Transform an NSAttributedString to plain text

问题描述

我有一个 NSData 实例，该实例包含源自的属性文本（ NSAttributedString ） NSTextView 。我想将属性字符串转换为纯字符串（ NSString ），而无需进行任何格式的文本分析（在转换时，我无权访问原始NSTextView

I have an instance of NSData containing attributed text (NSAttributedString) originating from an NSTextView. I want to convert the attributed string to a plain string (NSString) without any formatting to do some text analysis (at the moment of conversion I do not have access to the originating NSTextView nor its NSTextStorage instance).

什么是最好的方法？

编辑：

出于好奇，我检查了以下结果：

Out of curiosity I examined the result of:

[[[self textView] textStorage] words]

做一些文本分析。结果数组包含NSSubTextStorage的实例（单词 Eastern的下面示例）：

which appeared to be a handy thing for doing some text analysis. The resulting array contains instances of NSSubTextStorage (example below of the word "Eastern"):

Eastern {
NSFont = ＼ ＼ LucidaGrande 11.00点。 P []（0x7ffcaae08330）fobj = 0x10a8472d0，spc = 3.48\;
NSParagraphStyle =对齐方式0，LineSpacing 0，ParagraphSpacing 0，ParagraphSpacingBefore 0，HeadIndent 0，TailIndent 0，
FirstLineHeadIndent 0，LineHeight 0/0，LineHeightMultiple 0，
LineBreakMode 0，制表符（＼ ＼n 28L，\n 56L，\n 84L，\n 112L，\n

140L，\n 168L，\n 196L，\224L，\n 252L ，\n 280L，\n

308L，\n 336L\n），DefaultTabInterval 0，块（null），列表（null），
BaseWritingDirection -1，HyphenationFactor 0 ，TighteningFactor 0.05，
HeaderLevel 0; }

Eastern{ NSFont = "\"LucidaGrande 11.00 pt. P [] (0x7ffcaae08330) fobj=0x10a8472d0, spc=3.48\""; NSParagraphStyle = "Alignment 0, LineSpacing 0, ParagraphSpacing 0, ParagraphSpacingBefore 0, HeadIndent 0, TailIndent 0, FirstLineHeadIndent 0, LineHeight 0/0, LineHeightMultiple 0, LineBreakMode 0, Tabs (\n 28L,\n 56L,\n 84L,\n 112L,\n
140L,\n 168L,\n 196L,\n 224L,\n 252L,\n 280L,\n
308L,\n 336L\n), DefaultTabInterval 0, Blocks (null), Lists (null), BaseWritingDirection -1, HyphenationFactor 0, TighteningFactor 0.05, HeaderLevel 0"; }

NSSubTextStorage可能是私有类，因为我找不到任何文档。它还保留所有格式。

NSSubTextStorage is probably a private class as I could not find any documentation for it. It also retains all formatting.

推荐答案

如果我对您的理解正确，则您有一个 NSData ，例如 data ，其中包含编码的 NSAttributedString 。要逆转该过程，请执行以下操作：

If I understand you correctly you have an NSData, say data, containing an encoded NSAttributedString. To reverse the process:

NSAttributedString *nas = [[NSAttributedString alloc] initWithData:data
                                                           options:nil
                                                documentAttributes:NULL
                                                             error:NULL];

然后获取没有属性的纯文本，然后执行以下操作：

and to get the plain text without attributes you then do:

NSString *str = [nas string];

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