Gesture Recognizers
With gesture recognizers, Apple added a powerful way to detect specific gestures in your interface. Gesture recognizers simplify touch design. They encapsulate touch methods, so you don’t have to implement them yourself, and they provide a target-action feedback mechanism that hides implementation details. They also standardize how certain movements are categorized, as drags or swipes.
With gesture recognizer classes, you can trigger callbacks when iOS determines that the user has tapped, pinched, rotated, swiped, panned, or used a long press. These detection capabilities simplify development of touch-based interfaces. You can code your own for improved reliability, but a majority of developers will find that the recognizers, ...
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