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Editorial Team
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Asked: 2026-05-11T20:03:05+00:00

I need to associate a unique key to a UITouch instance throughout it’s lifecycle

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I need to associate a unique key to a UITouch instance throughout it’s lifecycle -Began, Moved, Ended, Cancelled. I’ve been printing NSLog on a key for each touch and noticed to my suprise that each touch does not generate a unique key if the key is generated as follows:

for (UITouch *touch in touches) {

// …

NSValue *key = [NSValue valueWithPointer:touch];

// …

}

How can I make each touch generate a unique key?

Thanks.

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1 Answer

  1. Editorial Team

    Actually, I found out the root cause of my need to do this. I was not handling a mult-tap situation where the tap count exceeded 1. The actual issue is handling tap counts.

    So, all touches are indeed unique. It is just that a touch can in fact contain multiple taps within a give touch.

    More here (Apple Developer Forum URL)

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