I have several applications that use the game kit to transfer files between devices, but in ios 7 the gamekit does not work correctly. I am wondering what should I use now.
Now you will want to use the Interworking Mechanism> in iOS 7 to:
Discovery of services provided by nearby iOS devices using Wi-Fi infrastructure, Wi-Fi peer-to-peer networks and Bluetooth personal networks and subsequently services by sending data based on messages, streaming data and resources (e.g. files)