let collectionView: UICollectionView = UICollectionView(frame: .zero, collectionViewLayout: UICollectionViewFlowLayout())

collectionView.register(UINib(nibName: "ListCollectionViewCell", bundle: nil), forCellWithReuseIdentifier: "ListCollectionViewCell")
collectionView.register(UINib(nibName: "ListCollectionReusableView", bundle: nil), forSupplementaryViewOfKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "ListCollectionReusableView")

        collectionView
            .conv()
            
            // Create sections for count of elements.
            .create(for: SectionType.elements) { (sectionType, section) in
                // In closure passed each element from elements and configuration for section.
                
                // Section has creating section header or footer method.
                // `create header or footer` method to use generics and convert automaticary each datasource and delegate method.(e.g SectionHeaderFooter<ListCollectionReusableView>)
                section.create(.header, headerOrFooter: { (header: SectionHeaderFooter<ListCollectionReusableView>) in
                    
                    // Setting each property and wrapped datasource or delegate method
                    header.reusableIdentifier = "ListCollectionReusableView"
                    header.size = CGSize(width: UIScreen.main.bounds.width, height: 50)
                    header.configureView { view, _ in
                        // `view` was converted to ListCollectionReusableView
                        
                        view.nameLabel.text = "\(sectionType)".uppercased()
                        view.nameLabel.textColor = .white
                        view.backgroundColor = sectionType.backgroundColor
                    }
                })
                
                // Section has creating items for count of elements.
                // `create item` method to use generics type and convert automaticary to each datasource and delegate method. (e.g Item<ListCollectionViewCell>)
                section.create(for: viewModels(section: sectionType), items: { (viewModel, item: Item<ListCollectionViewCell>) in
                    // In closure passed each element from elements and configuration for section.
                    
                    // Setting each property and wrapped datasource or delegate method
                    item.reusableIdentifier = "ListCollectionViewCell"
                    item.sizeFor({ _ -> CGSize in
                        let gridCount: CGFloat = 3
                        let edge = floor((UIScreen.main.bounds.width - (gridCount - 1)) / gridCount)
                        let size = CGSize(width: edge, height: edge)
                        return size
                    })
                    
                    item.configureCell { (cell, info) in
                        
                        // cell was converted to ListCollectionViewCell
                        cell.setup(with: viewModel)
                    }
                    
                    item.didSelect { [weak self] (item) in
                        let viewController = DetailViewController(imageName: viewModel.imageName)
                        self?.navigationController?.pushViewController(viewController, animated: true)
                    }
                })
        }

collectionView.reload()

item.configureCell { (cell, info) in

    // cell was converted to ListCollectionViewCell
    cell.setup(with: viewModel)
}