iOS application development services

    /
    //  FinancialReport.swift
    //
    //  Copyright © 2018DB2limited. All rights reserved.
    //
    import UIKit
    UICollectionViewDelegateFlowLayout {
        func collectionView(_ collectionView: UICollectionView,
            layout collectionViewLayout: UICollectionViewLayout,
            sizeForItemAt indexPath: IndexPath) -> CGSize {
            let width = collectionView.frame.width
            return CGSize.init(width: width, height: width)
        }

        func collectionView(_ collectionView: UICollectionView,
                            viewForSupplementaryElementOfKind kind: String,
                            at indexPath: IndexPath) -> UICollectionReusableView {
            switch kind {
            case UICollectionView.elementKindSectionHeader:
                    guard let items = specials else { fatalError() }
                    return style!.horizontalHeader(for: indexPath,
                    in: collectionView, with: items, delegate: self)
            default:
                fatalError("Unexpected element kind")

            }
        }
    }