AlternateWrapper.mm

-(void)onLevelReloaded:( SCLevelResponse* )levelResponse
{
    NSParameterAssert( nil != levelResponse );
    NSParameterAssert( nil != levelResponse.levelParentItem );
    
    self->_loadedLevel = levelResponse;
    
    // register cells as content has been loaded
    for ( SCItem* item in levelResponse.levelContentItems )
    {
       [ self.gridModeCellBuilder itemsBrowser: self
                           registerCellForItem: item ];
    }

    
    [ self.collectionView reloadData ];
    
    [ self.delegate itemsBrowser: self
             didLoadLevelForItem: levelResponse.levelParentItem ];
}


-(UICollectionViewCell*)collectionView:( UICollectionView* )collectionView
                cellForItemAtIndexPath:( NSIndexPath* )indexPath
{
    NSParameterAssert( nil != self->_loadedLevel                   );
    NSParameterAssert( nil != self->_loadedLevel.levelParentItem   );
    NSParameterAssert( nil != self->_loadedLevel.levelContentItems );
    
    NSUInteger cellIndex = static_cast<NSUInteger>( indexPath.row );
    id itemObject = self->_loadedLevel.levelContentItems[cellIndex];
    BOOL isLevelUpItem = [ itemObject isMemberOfClass: [ SCLevelUpItem class ] ];
  
    UICollectionViewCell* result = nil;
    if ( isLevelUpItem )
    {
        NSString* reuseId = [ self.gridModeCellBuilder itemsBrowser: self
                           reuseIdentifierForLevelUpItemAtIndexPath: indexPath ];
        
        result = [ self.collectionView dequeueReusableCellWithReuseIdentifier: reuseId
                                                                 forIndexPath: indexPath ];
    }
    else
    {
        NSString* reuseId = [ self.gridModeCellBuilder itemsBrowser: self
                                             reuseIdentifierForItem: (SCItem*)itemObject
                                                        atIndexPath: indexPath ];
        
        UICollectionViewCell<SCItemCell>* cell =
        [ self.collectionView dequeueReusableCellWithReuseIdentifier: reuseId
                                                        forIndexPath: indexPath ];
                                                                 
        [ cell setModel: itemObject ];
        [ cell reloadData ];
        
        result = cell;
    }
    
    return result;
}

CollectionViewWrapper.mm

-(UICollectionViewCell*)collectionView:( UICollectionView* )collectionView
                cellForItemAtIndexPath:( NSIndexPath* )indexPath
{
    NSParameterAssert( nil != self->_loadedLevel                   );
    NSParameterAssert( nil != self->_loadedLevel.levelParentItem   );
    NSParameterAssert( nil != self->_loadedLevel.levelContentItems );
    
    NSUInteger cellIndex = static_cast<NSUInteger>( indexPath.row );
    id itemObject = self->_loadedLevel.levelContentItems[cellIndex];
    BOOL isLevelUpItem = [ itemObject isMemberOfClass: [ SCLevelUpItem class ] ];
  
    UICollectionViewCell* result = nil;
    if ( isLevelUpItem )
    {
        // calls
        // registerClass:forCellWithReuseIdentifier:
        // dequeueReusableCellWithReuseIdentifier:forIndexPath:
        result = [ self.gridModeCellBuilder itemsBrowser: self
                            createLevelUpCellAtIndexPath: indexPath ];
    }
    else
    {
        // calls
        // registerClass:forCellWithReuseIdentifier:
        // dequeueReusableCellWithReuseIdentifier:forIndexPath:
        UICollectionViewCell<SCItemCell>* cell =
        [ self.gridModeCellBuilder itemsBrowser: self
                      createGridModeCellForItem: (SCItem*)itemObject
                                    atIndexPath: indexPath ];
        
        [ cell setModel: itemObject ];
        [ cell reloadData ];
        
        result = cell;
    }
    
    return result;
}