Re: Tracking Multiple Touches For Appropriate Label
Re: Tracking Multiple Touches For Appropriate Label
- Subject: Re: Tracking Multiple Touches For Appropriate Label
- From: Chunk 1978 <email@hidden>
- Date: Tue, 8 Dec 2009 04:58:23 -0500
thanks for the links. i'm really surprised with how complicated this
is. i'm also equally surprised that there is not a lot of small
sample code online
On Tue, Dec 8, 2009 at 3:50 AM, mmalc Crawford <email@hidden> wrote:
>
> On Dec 8, 2009, at 12:38 am, mmalc Crawford wrote:
>
>>> is this suppose to work for multiple touches where one touch is
>>> already present, then another touches the screen?
>>>
>> Yes, it does; tested in a working application.
>>
>>> it's not working for me. each time i touch the screen and add an object to the
>>> myTouches array the return count always returns 1, no matter how many
>>> fingers i already have touching the screen.
>>>
>> Then despite your original assertion, it is likely that you haven't set multipleTouchEnabled on your view.
>>
> I misread the reply.
>
> Per the documentation for touchesBegan:withEvent:,
> "touches
> A set of UITouch instances that represent the touches for the starting phase of the event represented by event."
> <http://developer.apple.com/iphone/library/documentation/UIKit/Reference/UIResponder_Class/Reference/Reference.html#//apple_ref/occ/instm/UIResponder/touchesBegan:withEvent:>
> (see also <http://developer.apple.com/iphone/library/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/EventHandling/EventHandling.html#//apple_ref/doc/uid/TP40007072-CH9-SW15>).
>
> If you already have one finger touching the screen, and you add another, then 'touches' will only contain one touch.
> If you want the coordinates of all the current touches that happen to be present when another touch is added, then you need to get allTouches from the event.
>
> mmalc
>
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