Attributed strings and custom attributes

FROM : Jeremy Dronfield
DATE : Thu Jul 20 14:56:37 2006

Has anyone come up with a way of getting custom attributes on an 
attributed string to save?

I'm using -[NSAttributedString 
RTFDFileWrapperFromRange:documentAttributes:] to save the contents of 
a text view containing text with custom attributes. (The value of the 
custom attribute type is an NSDictionary containing metadata. The 
metadata is related to an NSTextAttachment which is added to the same 
piece of text as the custom attribute.)  When the file is reloaded 
into the text view, my custom attributes have disappeared. A trawl of 
the archives suggests that this has been a perennial problem, but 
offers no solutions other than archiving, which is of no use to me in 
this situation.

Regards,
Jeremy