On Jul 12, 2011, at 4:49 PM, Nathan Sims wrote:
> On Jul 12, 2011, at 4:46 PM, Fritz Anderson wrote:
>> On 12 Jul 2011, at 6:30 PM, Nathan Sims wrote:
>>> I have a, iOS 4.3.3 UIView that is touch-enabled. When my
>>> -touchesBegan:withEvent: method gets called, I can't figure out how to
>>> differentiate when the user touched the screen with one finger or with two.
>>> Either way, I receive this:
>>>
>>> <UITouchesEvent: 0x1796e0> timestamp: 423888 touches: {(
>>> <UITouch: 0x1d2ab0> phase: Began tap count: 1 window: <UIWindow: 0x197ac0;
>>> frame = (0 0; 768 1024); opaque = NO; autoresize = RM+BM; layer = <CALayer:
>>> 0x197c40>> view: <UIView: 0x1a1330; frame = (20 0; 748 1024); transform =
>>> [0, -1, 1, 0, 0, 0]; autoresize = W+H; layer = <CALayer: 0x1a13c0>>
>>> location in window: {572, 338} previous location in window: {572, 338}
>>> location in view: {686, 552} previous location in view: {686, 552}
>>> )}
>>>
>>> It tells me the 'tap count' but nowhere does it indicate if the user
>>> applied two fingers or just one. Instead of double-tapping or some other
>>> gesture, I need to make two fingers to mean 'quit the ongoing activity' to
>>> my program, whereas one finger means 'change value according to where the
>>> finger touched'.
>>>
>>> Am I looking in the wrong place for this touch information?
>>
>> The other parameter is there for a reason. It is a set of UITouches. Sets
>> can be counted.
>
> I know, but [touches count] always returns 1, so I've resorted to [[event
> allTouches] count]; seems to work reliably.
> Thanks!
The set of touches passed to -touchesBegan:withEvent: include only the
newly-touched touches. Existing touches already in progress are not part of
that set, but are part of -allTouches.
Most likely, you're seeing the user's fingers not hit the screen
simultaneously. Then you would get two calls to -touchesBegan:withEvent:, each
with one new touch.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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