NSFetchedResultsController & UICollectionView using blocks (Moved Items & Deleted/Inserted Sections Fix)

NSFetchedResultsController+UICollectionView.m

@interface YourNSFetchedResultsControllerDelegate () <NSFetchedResultsControllerDelegate>

@end

@implementation YourNSFetchedResultsControllerDelegate {
	
	UICollectionView *_collectionView;
	
	NSMutableArray *_collectionViewUpdatesQueue;
	
	}

	#pragma mark -
	#pragma mark NSFetchedResultsControllerDelegate methods

	- (void) controllerWillChangeContent:(NSFetchedResultsController*)controller {
		_collectionViewUpdatesQueue = [NSMutableArray new];
	}

	- (void) controller:(NSFetchedResultsController*)controller didChangeSection:(id<NSFetchedResultsSectionInfo>)sectionInfo atIndex:(NSUInteger)sectionIndex forChangeType:(NSFetchedResultsChangeType)type {
		__weak UICollectionView *collectionView = _collectionView;
		
		switch(type){
			case NSFetchedResultsChangeInsert: {
				[_collectionViewUpdatesQueue addObject:^{
					[collectionView insertSections:[NSIndexSet indexSetWithIndex:sectionIndex]];
				}];
				
				break;
			}
			case NSFetchedResultsChangeDelete: {
				[_collectionViewUpdatesQueue addObject:^{
					[collectionView deleteSections:[NSIndexSet indexSetWithIndex:sectionIndex]];
				}];
				
				break;
			}
			case NSFetchedResultsChangeUpdate: {
				[_collectionViewUpdatesQueue addObject:^{
					[collectionView reloadSections:[NSIndexSet indexSetWithIndex:sectionIndex]];
				}];
				
				break;
			}
			default: break;
		}
	}

	- (void) controller:(NSFetchedResultsController*)controller didChangeObject:(id)anObject atIndexPath:(NSIndexPath*)indexPath forChangeType:(NSFetchedResultsChangeType)type newIndexPath:(NSIndexPath*)newIndexPath {
		__weak UICollectionView *collectionView = _collectionView;
		
		switch(type){
			case NSFetchedResultsChangeInsert: {
				[_collectionViewUpdatesQueue addObject:^{
					[collectionView insertItemsAtIndexPaths:@[ newIndexPath ]];
				}];
				
				break;
			}
			case NSFetchedResultsChangeDelete: {
				[_collectionViewUpdatesQueue addObject:^{
					[collectionView deleteItemsAtIndexPaths:@[ indexPath ]];
				}];
				
				break;
			}
			case NSFetchedResultsChangeUpdate: {
				[_collectionViewUpdatesQueue addObject:^{
					[collectionView reloadItemsAtIndexPaths:@[ indexPath ]];
				}];
				
				break;
			}
			case NSFetchedResultsChangeMove: {
				/*
					This is here to fix a bug(?) with UICollectionView.
					Basically, it does not like it when you try to move items
					from a section that will be deleted, or to a section that will be inserted.
				*/

				[_collectionViewUpdatesQueue addObject:^{
					[collectionView deleteItemsAtIndexPaths:@[ indexPath ]];
					[collectionView insertItemsAtIndexPaths:@[ newIndexPath ]];
				}];
				
				break;
			}
			default: break;
		}
	}

	- (void) controllerDidChangeContent:(NSFetchedResultsController*)controller {
		[_collectionView performBatchUpdates:^{
			for(void(^updateBlock)() in _collectionViewUpdatesQueue) updateBlock();
		} completion:nil];
		
		_collectionViewUpdatesQueue = nil;
	}

@end

Uses blocks to queue collection view updates and replaces [UICollectionView moveItemAtIndexPath:toIndexPath:] with an deletion and insert in order to fix the (above) mentioned bug.