Phases
Touches have life cycles. Each touch can pass through any of five phases that represent the progress of the touch within an interface. These phases are as follows:
UITouchPhaseBegan—Starts when the user touches the screen.
UITouchPhaseMoved—Means a touch has moved on the screen.
UITouchPhaseStationary—Indicates that a touch remains on the screen surface but that there has not been any movement since the previous event.
UITouchPhaseEnded ...
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