DrupalRESTKit is an iOS 7.x library built on the top of AFNetworking. It simplifies developer tasks to consume REST services provided by Drupal 8. Currently it simplifies CRUD operations on 'node' and 'user' entity type.
Drupal 7 may have some support for REST API , perhaps as an external module or so. But REST module is shipped with Drupal 8 by default .
So if install REST and related module with Drupal 7 it should work.
Drupal 7 may have some support for REST API , perhaps as an external module or so. But REST module is shipped with Drupal 8 by default . So if install REST and related module with Drupal 7 it should work.