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iOS

Method for moving rows with NSFetchedResultsController and its delegate not working

I've been trying to follow this tutorial for rearranging rows in a table view while using NSFetchedResultsController and NSFetchedResultsController delegate, but my project is extremely buggy. What happens is that when I try rearranging a row and drop it, the rows are randomised (probably not randomised, but I can't see the pattern to find the problem). What's wrong with my implementation?

Please refer to this link for more info.

Thanks!