IPhone UIImageView pinch zoom?

Generally speaking, whenever you implement a continuous UI behavior, you need to measure it against something that does not change.

Generally speaking, whenever you implement a continuous UI behavior, you need to measure it against something that does not change. So if your touches cause the View transformation to change, you should measure the touches against something that does not change - your parent view for instance. So, instead of calling : touch locationInView:self you should use touch locationInView:self superview I am not sure if this will fix your problem, but it will eliminate one possible cause of your troubles.

That was it! Thank you very much. – cameron Jan 25 '10 at 22:14.

I've just done this on a recent project and it worked well.

Yep ... about a thousand times easier than the other way. Thanks! – glenc Nov 26 '10 at 21:58.

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