What's the point of setting Reuse Identifier for Collection View Cell in Interface Builder?

Question

Collection Reusable Views, including Collection View Cells (which is a subclass), have a field in Interface Builder called "Identifier" with prompt "Reuse Identifier".

However, you normally use it by registering it with the UICollectionView using the –registerNib:forCellWithReuseIdentifier: and –registerNib:forSupplementaryViewOfKind:withReuseIdentifier: methods, where you also specify a reuse identifier.

So then what's the point of setting one in Interface Builder? It seems to make no difference whether you set it there or not.

Answer 1

If you implicitly load a collection view from a storyboard you only have to do

UICollectionView *cell = [self.collectionView dequeueReusableCellWithReuseIdentifier:@"CollectionViewCell" forIndexPath:indexPath];

to get the cell. You don't need to call registerNib:. This only works if you set a reuse identifier.

Answer 2

For NibCell (UICollectionView in a Nib) you must use registerNib:, that's only way. If you give your Cell in Nib a reuse identifier, this identifier must same in register so better leave it blank.

-Cell by Code: registerClass

-Cell in Nib(Xib) registerNib

-Cell in StoryBoard: don't register

One more answer of mine here