There are few games thus far to have controller support for the iOS7. Alien vs. Predator being the first one. And after that, it has been confirmed that the Walking dead and bastion also got theirs. Among those games, Limbo is the latest AAA indie game to receive iOS7 controller support.
Some other games offered basic support for the iOS7 just to prevent their apps from crashing or to provide compatibility for the latest iOS. The iOS7 has been out there for sometime so we hope to see more titles to receive support for the iOS7 soon.