presentationLayer position property yielding bad values on iPad, no problem with iPhone

I have a game with several small objects animated using CAKeyframeAnimation. Objects animate perfectly 开发者_Go百科for BOTH iPhone and iPad. However, the value of the position property of the animated CALayers' presentationLayers only yield reasonable values on the iPhone. I use the current position of the animating objects for hit testing. Any ideas of differences in this area between iPad and iPhone/iPod Touch?

The position points for iPhone show expected incremental change as objects animate; on iPad I see peculiar values, for example this sequence: <-36893488147419103232.000000,2.607987>, <-0.000000,2.658927>, <0.000000,2.709929>, <36893488147419103232.000000,2.755450>, ...

Other properties of the presentationLayer are correct (these are properties whose values don't change during the animation, however).

After the animation finishes, the presentationLayer position value IS accurate.

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Exactly same problem here!! and it looks that is a bug starting with 3.2 version of the SDK... Actually I did a iPhone app (using 3.1 SDK) that it is completely based on CAAnimation, when I installed and ran the the app on an iPhone with 3.2 nothing works!!!... but on devices that has 3.1 works perfectly. I google it and I found another people with exactly the same problem.

take a look at the bottom of the following forum

http://www.iphonedevsdk.com/forum/iphone-sdk-development/19622-current-position-animating-calayer.html

Could you solved this issue or found a workaround?