Reloading a UICollectionView using reloadData method returns immediately before reloading data

Question

I need to know when reloading a UICollectionView has completed in order to configure cells afterwards (because I am not the data source for the cells - other wise would have

Answer 1

Collection view is not supported to be reloaded animatedly with help of reloadData. All animations must be performed with methods, such as

[collectionView deleteItemsAtIndexPaths:indexesToDelete];
[collectionView insertSections:sectionsToInsert];
[collectionView reloadItemsAtIndexPaths:fooPaths];

inside of performBatchUpdates: block. That reloadData method can only be used for rough refresh, when all items are removed and laid out again without animation.