UITapGestureRecognizer Class Reference

Overview

UITapGestureRecognizer is a concrete subclass of UIGestureRecognizer that looks for single or multiple taps. For the gesture to be recognized, the specified number of fingers must tap the view a specified number of times.

Although taps are discrete gestures, they are discrete for each state of the gesture recognizer; thus the associated action message is sent when the gesture begins and is sent for each intermediate state until (and including) the ending state of the gesture. Code that handles tap gestures should therefore test for the state of the gesture, for example:

- (void)handleTap:(UITapGestureRecognizer *)sender {     if (sender.state == UIGestureRecognizerStateEnded)     {         // handling code     } }

Action methods handling this gesture may get the location of the gesture as a whole by calling the UIGestureRecognizer method locationInView:; if there are multiple taps, this location is the first tap; if there are multiple touches, this location is the centroid of all fingers tapping the view. Clients may get the location of particular touches in the tap by calling locationOfTouch:inView:; if multiple taps are allowed, this location is that of the first tap.