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Prior to iOS 4, the identification of a gesture was the responsibility of the application developer and typically involved the creation of complex mathematical algorithms. In recognition of this complexity and given the importance of gestures to user interaction with the iPad Apple introduced the UIGestureRecognizer class in iOS 4 thereby making the task of identifying the types of gestures a much easier task for the application developer.
The goal of this chapter, therefore, is to provide an overview of gesture recognition within the context of iOS 5 and the iPad. The next chapter will work through an [[An iPad iOS 5 Gesture Recognition Tutorial]].
== The UIGestureRecognizer Class ==
