Tracking Touches
UIControl instances use an embedded method set to work with touches. These methods allow the control to track touches throughout their interaction with the control object:
beginTrackingWithTouch:withEvent:—Called when a touch enters a control’s bounds.
continueTrackingWithTouch:withEvent:—Follows the touch with repeated calls as the touch remains within the control bounds.
endTrackingWithTouch:withEvent:—Handles the last touch for ...
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