Re: Attributed strings and custom attributes
Re: Attributed strings and custom attributes
- Subject: Re: Attributed strings and custom attributes
- From: Douglas Davidson <email@hidden>
- Date: Thu, 20 Jul 2006 09:53:04 -0700
On Jul 20, 2006, at 5:56 AM, Jeremy Dronfield wrote:
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.
This is a difficult problem, and one that has been on our minds. It
is technically possible to include custom information within RTF, but
it is not easy to provide a generalized facility for doing so. For
now, if you wish to have RTFD-persistent information associated with
attachments, you will need to include it by some means or other with
the contents of the attached files.
For example, you could write out a container file of some sort that
includes both your metadata and the actual contents of the original
attached file, and then split out the two parts after reading in the
document. Alternatively, it would also be possible to add additional
files to the RTFD file wrapper, alongside the attached files, but you
would need to arrange a mapping between the attached files and the
metadata files. As another alternative, you could add a single
additional attached file at the end of the document, representing a
dictionary of dictionaries mapping from attached files to metadata
dictionaries.
Douglas Davidson
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