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iOS 8 SDK Development, 2nd Edition by Janie Clayton, Chris Adamson

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Chapter 11Recognizing Gestures

Touch is the defining trait of user interfaces on the iPhone and iPad. It’s what makes working with the data seem so direct: flicking a table to scroll it, pinching a photo to resize it, or drawing freehand with our fingers. iOS builds in sensible touch controls for all of its provided views, and we can build upon those further by creating our own.

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