Re: detecting touch and hold vs touch in UIButton
Re: detecting touch and hold vs touch in UIButton
- Subject: Re: detecting touch and hold vs touch in UIButton
- From: Matt Neuburg <email@hidden>
- Date: Sun, 06 Jun 2010 09:11:05 -0700
- Thread-topic: detecting touch and hold vs touch in UIButton
On or about 6/6/10 8:54 AM, thus spake "Alejandro Marcos Aragón"
<email@hidden>:
> If the user just taps the button, a UISegmentedControl appears, thus this
> target is in touch up inside. Now, if the user taps and holds, another type of
> control appears after a delay so this has to be done in touch down (because
> the user is still holding), and the user should stop holding the button when
> the new control appears.
Okay, so obviously you then also use performSelector as you were doing,
because you have to respond a certain amount of time after the touch starts
if the touch has not ended. But you still don't need to add and remove
target-action pairs.
- (void) tapAndHold {
NSLog(@"respond to tap and hold");
}
- (void) userDidTouchDown: (id) sender event: (UIEvent*) e {
downtime = [e timestamp];
[self performSelector:@selector(tapAndHold) withObject:nil
afterDelay:0.4];
}
- (void) userDidTouchUp: (id) sender event: (UIEvent*) e {
double diff = [e timestamp] - downtime;
if (diff < 0.3) {
[[self class] cancelPreviousPerformRequestsWithTarget:self];
NSLog(@"respond to tap");
}
}
The numbers are up to you, of course. m.
--
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