Re: -[NSAttributedString initWithData:...] compresses spaces?
Re: -[NSAttributedString initWithData:...] compresses spaces?
- Subject: Re: -[NSAttributedString initWithData:...] compresses spaces?
- From: Douglas Davidson <email@hidden>
- Date: Thu, 27 Apr 2006 15:28:16 -0700
On Apr 27, 2006, at 3:12 PM, Glen Simmons wrote:
I'm using -[NSAttributedString
initWithData:options:documentAttributes:error:] with some XHTML
that looks like this:
<html xmlns="http://www.w3.org/1999/xhtml";>
<p>
<font face="Lucida Grande" size="5">a</font>
<font face="Garamond" size="5"> </font>
<font face="Lucida Grande" size="5">a</font>
</p>
</html>
The problem is that the NSAttributedString I end up with only has
one space between the two a's instead of the 4 that it should. How
can I get it to preserve the spaces?
NSAttributedString is behaving correctly here; any browser would do
the same. If you like you could spend some quality time with the
HTML, XHTML, and XML specs, and find out exactly what they specify
with regard to treatment of whitespace, but I warn you that it's not
pretty.
The usual way to get multiple spaces in HTML is to use non-breaking
spaces (either literal or entities), or a mixture of nbsp and
ordinary spaces, in such a way as never to have consecutive ordinary
spaces. That's what NSAttributedString does when it writes out HTML.
If you really want your whitespace to be read in as ordinary spaces
rather than as nbsp and spaces, there is an Apple-specific mechanism
for that. Surround your mixture of nbsp and spaces with <span
class="Apple-converted-space"></span>, and it will be converted back
into spaces when NSAttributedString reads it in.
Try saving as HTML in TextEdit, and you'll see all of this in
action. You can control what flavor of HTML is generated, and
whether <span class="Apple-converted-space"> is used, by manipulating
the "HTML saving options" in the "Open and Save" portion of
TextEdit's preferences.
Douglas Davidson
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