A UICollectionView implementation of UIListContentConfiguration

SimpleCollectionView.swift

import UIKit

class SimpleCollectionView: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
    private var collectionView: UICollectionView!
    private var cellRegistration: UICollectionView.CellRegistration<UICollectionViewListCell, Book>!

    override func viewDidLoad() {
        super.viewDidLoad()
        // View title
        title = "Books - Collection"
        // Collection view layout
        let config = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
        let layout = UICollectionViewCompositionalLayout.list(using: config)
        // Add collection view
        collectionView = UICollectionView(frame: view.bounds, collectionViewLayout: layout)
        collectionView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        view.addSubview(collectionView)
        collectionView.delegate = self
        collectionView.dataSource = self
        // Cell registration
        cellRegistration = UICollectionView.CellRegistration<UICollectionViewListCell, Book> { cell, indexPath, book in
            var content = cell.defaultContentConfiguration()
            content.image = book.authType == .single ? UIImage(systemName: "person.fill") : UIImage(systemName: "person.2.fill")
            content.text = book.title
            content.secondaryText = book.author
            cell.contentConfiguration = content
        }
    }
    
    // MARK: - Collection View Data Source / Delegates
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return Book.sections.count
    }

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return Book.booksFor(section: section).count
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let section = Book.sections[indexPath.section]
        let arr = Book.books[section]!
        let book = arr[indexPath.row]
        let cell = collectionView.dequeueConfiguredReusableCell(using: cellRegistration, for: indexPath, item: book)
        return cell
    }
}