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

问题描述

我需要一个自定义的属性添加到在NSTextView选中的文本。因此，我可以做到这一点通过获得所选项目的归属字符串，添加自定义属性，然后与我的新归因字符串替换选择。

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.

所以，现在我得到的文本视图的归属字符串的NSData，并将其写入文件。后来，当我打开该文件，并将其恢复到文本查看我的自定义属性都不见了！制定出整个计划为我的自定义属性后，我发现，自定义属性不会被保存为您服务。看看这里的重要注意事项：<一href=\"http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/AttributedStrings/Tasks/RTFAndAttrStrings.html\">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，我不知道如何保存和使用该自定义属性恢复我的文档。任何帮助吗？

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

推荐答案

节约的正常方式的 NSAttributedString 是使用RTF，和RTF数据是什么 -dataFromRange：documentAttributes：错误：的方法 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.

不过，RTF格式的有自定义属性的支持。相反，你应该使用 NSCoding 协议存档您的归属字符串，将preserve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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