One problem you are having here is how you are saving the indexPath in lastIndexPath. You need to retain the indexPath you are saving in lastIndexPath. The indexPath passed into this method is autoreleased so it will likely get released out from under you if you don't retain it.
This could be causing your crash.
This is probably exactly what you are looking for. I developed this for one of my apps. Enjoy!
(if so please mark as answered) Also note that I'm using ARC, so no retain and release.
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