[业评] 掌机之于手机，不是家用机之于PC的关系。

iOS 7 已经开始支持外置手柄了，  为软件开发商提供了统一的接口，然后有罗技这样的硬件厂商生产外接手柄。

可以去找WWDC2013的视频看看， 里面有介绍。



The Game Controller framework in iOS 7 and OS X 10.9 enables games to integrate with physical game controllers and take advantage of exciting new modes of input. Learn how to add support for MFi game controllers with physical d-pads, buttons, triggers, joysticks, and more. Understand the approach for discovering and connecting to controllers and how to support both wireless and form-fitting controller types. See how to map physical controls to game inputs, and get expert advice about the best practices to follow in your titles.