Apple

On Sep 28, 2016, at 11:22 AM, Tim Burgess <email@hidden> wrote:

I was hoping to use custom attributes with an NSMutableAttributedString to provide additional formatting information to VoiceOver users of our application. However, responses on this list indicated that VoiceOver’s support for attributed text was limited to those attributes defined in NSAccessibilityConstants.h. This information allowed me to provide spoken attribute information for the supported attributes, but this is not sufficient for our needs. I tried to work around the issue by using a text attachment and encoding a UTF8 string within an NSData structure as the attachment. However, VoiceOver failed to announce the attachment contents, presumably because it has no mechanism to understand how to unpack the NSData. Our application is a Braille translation package, so we need to support a large number of styles that do not exist in “normal” text

My PFAssistive framework <http://pfiddlesoft.com/frameworks> contains some methods that translate between accessibility attributed string attributes and standard Cocoa attributed string attributes. This isn't what you're looking for, exactly, but you could look at the headers and documentation, and they might give you some ideas.