在NSAttributedString中保存自定义属性 [英] Saving custom attributes in NSAttributedString

问题描述

我需要在NSTextView中为所选文本添加自定义属性。所以我可以通过获取属性字符串的选择，添加一个自定义属性，然后用我新的属性字符串替换选择。

I need to add a custom attribute to the selected text in an NSTextView. So I can do that by getting the attributed string for the selection, adding a custom attribute to it, and then replacing the selection with my new attributed string.

现在我将文本视图的属性字符串作为NSData并将其写入文件。后来当我打开该文件，并将其还原到文本视图我的自定义属性已经走了！完成我的自定义属性的整个方案后，我发现自定义属性不会为您保存。请查看此处的重要注意事项： http：/ /developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/AttributedStrings/Tasks/RTFAndAttrStrings.html

So now I get the text view's attributed string as NSData and write it to a file. Later when I open that file and restore it to the text view my custom attributes are gone! After working out the entire scheme for my custom attribute I find that custom attributes are not saved for you. Look at the IMPORTANT note here: http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/AttributedStrings/Tasks/RTFAndAttrStrings.html

所以我不知道如何使用此自定义属性保存和恢复我的文档。任何帮助？

So I have no idea how to save and restore my documents with this custom attribute. Any help?

推荐答案

保存 NSAttributedString 的正常方法是使用RTF和RTF数据是 -dataFromRange：documentAttributes：error：方法 NSAttributedString 生成

The normal way of saving an NSAttributedString is to use RTF, and RTF data is what the -dataFromRange:documentAttributes:error: method of NSAttributedString generates.

但是，RTF格式不支持自定义属性。相反，您应该使用 NSCoding 协议归档您的属性字符串，这将保留自定义属性：

However, the RTF format has no support for custom attributes. Instead, you should use the NSCoding protocol to archive your attributed string, which will preserve the custom attributes:

//asssume attributedString is your NSAttributedString
//encode the string as NSData
NSData* stringData = [NSKeyedArchiver archivedDataWithRootObject:attributedString];
[stringData writeToFile:pathToFile atomically:YES];

//read the data back in and decode the string
NSData* newStringData = [NSData dataWithContentsOfFile:pathToFile];
NSAttributedString* newString = [NSKeyedUnarchiver unarchiveObjectWithData:newStringData];

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