How to tell if a subview was tapped twice

Question

I have a UIImageView that I allocated inside of a UIView. I want to double tap that subview using the TOUCHESENDED or TOUCHESBEGAN and send a callback or at least a log. I would appreciate anyone who can upload some code.

Answer 1

As per the documentation, it is not recommended to subclass UIImageView, but this is for drawing, if you only want to catch events, you may subclass UIImageVIewand catch the event. Then look at the tapCount property of the touch. As per http://developer.apple.com/iPhone/library/documentation/UIKit/Reference/UITouch_Class/Reference/Reference.html#//apple_ref/occ/instp/UITouch/tapCount

Answer 2

Here's how to use the .tapCount property inside touchesBegan:

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
{
 NSUInteger numTaps = [[touches anyObject] tapCount];
 UITouch *touch = [[event allTouches] anyObject];

 if ([touch view] == yourThing) {
   NSLog(@"%i taps", numTaps);
 }
}