I want to share data in specific wordpress database tables with an iOS app. The client wants data entry via wordpress form plugins which create their own tables in the wp database. The plugins I've looked at don't have APIs themselves and examples of wordpress REST APIs all use AJAX which I'm not familiar with and/or can only access info in wordpress posts or user data. Is there a way to do this via php that doesn't involve accessing the database directly? I fear changes in database structure with updates could break the app.
Here's one JSON API plugin I found in the Wordpress repo: http://wordpress.org/plugins/json-api/
I'm sure there are others. Just look around. Let me know if this helps clarify things a bit.