Library for both iOS and OS X apps? [closed]

Answer 1

You can do this with Targets.

Create a new project for a Cocoa Library. Then add a new target for a iOS Static Library. As you create new files ensure they're added to the appropriate targets (i.e. presumably both in your case) and set per-target build settings as required.

Projects using your library on the different platforms will need to link against the appropriate product but you won't need to duplicate your code.

Answer 2

Well, I finally found the correct set of Google search terms, so to answer my own question (DOH!), it seems to be possible to share code, at least between iPhone apps and possibly also iPhone and OS X apps within certain limits. You have to create a 'static library' and use 'cross-project references':

http://www.clintharris.net/2009/iphone-app-shared-libraries/
http://www.amateurinmotion.com/articles/2009/02/08/creating-a-static-library-for-iphone.html
http://zetetic.net/blog/2010/02/15/building-static-libraries-to-share-code-on-iphone-and-mac-os-x-projects/
http://weston-fl.com/blog/?p=808

Haven't tested any of this yet but it looks promising.