UICollectionView : how to animate the change of a cell?

Question

• In a initial state, my collection view has three cells, in one section : cell1, cell2 and cell3.

• In the next state, the first cell change and becomes cell1_bis. It has the same size.

Is it possible to animate this change cell1 -> cell1_bis?

Answer 1

Answer

Proceed this way:

 [self.collectionView

 performBatchUpdates:^
 {
     NSIndexPath * whereTheChangeIs = [NSIndexPath indexPathForItem:row
                                                          inSection:section] ;

     [self.collectionView deleteItemsAtIndexPaths:@[whereTheChangeIs]] ;
     [self.collectionView insertItemsAtIndexPaths:@[whereTheChangeIs]] ;
 }

 completion:^(BOOL finished)
 {
     // nothing
 }] ;

Question

Unfortunately, the following does not work. Bug?

 [self.collectionView

 performBatchUpdates:^
 {
     NSIndexPath * whereTheChangeIs = [NSIndexPath indexPathForItem:row
                                                          inSection:section] ;

     [self.collectionView reloadItemsAtIndexPaths:@[whereTheChangeIs]] ;
 }

 completion:^(BOOL finished)
 {
     // nothing
 }] ;