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[Jackie]

Originally Posted by jeff_lamarche

Setting a boolean is a bit kludgey, and will be hard to maintain for other tap situations (triple, quadruple, etc). There actually IS an "official" way to handle this situation described in the documentation. It's described, but Apple does not give sample code.

How you handle it is to call the correct method in each case using performSelector:withObject:afterDelay:, then, in each situation except single-tap, cancel the previous call before it executes (double-tap cancels the single-tap call, triple-tap cancels the double-tap call). This is what it might look like:

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
	UITouch *touch = [touches anyObject];
	NSUInteger tapCount = [touch tapCount];
	
	switch (tapCount) {
		case 1:
			[self performSelector:@selector(singleTapMethod) withObject:nil afterDelay:.4];
			break;
		case 2:
			[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(singleTapMethod) object:nil];
			[self performSelector:@selector(doubleTapMethod) withObject:nil afterDelay:.4];
			break;
		case 3:
			[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(doubleTapMethod) object:nil];
			[self performSelector:@selector(tripleTapMethod) withObject:nil afterDelay:.4];
			break;
		case 4:
			[NSObject cancelPreviousPerformRequestsWithTarget:self selector:@selector(tripleTapMethod) object:nil];
			[self quadrupleTap];
			break;
		default:
			break;
	}

}
@end

Thanks for the answer, it helps me~~