AdjustableDoubleTap.m

// Need: adjustable time-between and distance-between Successive Taps
//
//	as far as I can tell, UITapGestureRecognizer only recognizes a Successive Tap if it occurs
//	within 0.35 seconds AND within 45 points
//
// Typical Single-Tap and Double-Tap Gesture Recognizer setup...

	UITapGestureRecognizer *tapSingle = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gotSingleTap:)];
	UITapGestureRecognizer *tapDouble = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(gotDoubleTap:)];
	
	tapSingle.numberOfTapsRequired = 1;
	tapSingle.numberOfTouchesRequired = 1;
	
	tapDouble.numberOfTapsRequired = 2;
	tapDouble.numberOfTouchesRequired = 1;
	
	[tapSingle requireGestureRecognizerToFail:tapDouble];
	
	[_tapableView addGestureRecognizer:tapSingle];
	[_tapableView addGestureRecognizer:tapDouble];
	

// I'd like to be able to add (for example)...
	tapDouble.maxTimeBetweenTaps = 0.75;    // Successive Tap within 3/4 of a second should count
	tapDouble.maxDistanceBetweenTaps = 100;   // Successive Tap within 100 pt radius should count
	
// the alternative is to use only Single-Tap Gesture Recognizer (or even plain-old UIGestureRecognizer) 
//	and then track time and distance with Timers / Variables / calculations / etc...