IPhone enumerateGroupsWithTypes finish selector

Question

I use

[assetsLibrary enumerateGroupsWithTypes:groupTypes usingBlock:listGroupBlock failureBlock:failureBlock];

to list photo albums.

An enumerator acts as an “asynchronous” method, in other words, methods are returned before all elements are enumerated.

How do I know when the listing is complete?

I populate NSMutableArray with groups and call [myTableView reloadData]after the enumeration is complete.

Answer 1

Your listing will give your block a group of null pointers and stop true when the last pass has passed. You can use this to set a flag or call some termination code using the performSelectorOnMainThread function: the next time you go through RunLoop.

Answer 2

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