Is there a way to set a custom word spacing in CoreText?
I have looked around the paragraph properties where I would have expected to see this but found nothing.
I don't have deep experience in this but AFAIK you cannot adjust the space between words. So my list of possible solutions would be:
Adjust the kern value, however this will also adjust the space between letter which may not be what you want.
Add extra spaces. Crude, but you can increase the space between words by replace a single space with two.
(Really advanced) start adjusting individual glyphs. The best example I have found for doing is here: http://invasivecode.tumblr.com/core-text about 2/3rds down the author shows how to access the individual glyphs and adjust their settings.