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Chapter 17: Taps, Touches, and Gestures > Multitouch Terminology

Multitouch Terminology

Before we dive into the architecture, let's go over some basic vocabulary. First, a gesture is any sequence of events that happens from the time you touch the screen with one or more fingers until you lift your fingers off the screen. No matter how long it takes, as long as one or more fingers remain against the screen, you are still within a gesture (unless a system event, such as an incoming phone call, interrupts it). Note that Cocoa Touch doesn't expose any class or structure that represents a gesture. In some sense, a gesture is a verb, and a running app can watch the user input stream to see if one is happening.

A gesture is passed through the system inside a series of events. Events are generated when you interact with the device's multitouch screen. They contain information about the touch or touches that occurred.


  

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