class TextFormSection: HashableObject, CollectionViewSection {
    ...
}

func layoutSection(environment: NSCollectionLayoutEnvironment) -> NSCollectionLayoutSection

func registerCell(collectionView: UICollectionView) {
    // register cells here
}

func registerSupplementaryView(collectionView: UICollectionView) {
    // register supplementary views here
}

func configuredCell(_ collectionView: UICollectionView, indexPath: IndexPath) -> UICollectionViewCell

func configureSupplementaryView(_ view: UICollectionReusableView, indexPath: IndexPath)

var snapshotItems: [AnyHashable] {
    // return AnyHashable items
}

sections = [
    TextFormSection(
        items: [
            .init(
                initialText: nil,
                textForm: .init(
                    placeholder: "Email",
                    validationHandler: { text in
                        guard let text = text else {
                            return false
                        }
                        return text.isValidEmailAddress()
                    },
                    validationAppearance: .init(
                        textColor: .red
                    )
                )
            ),
            .init(
                initialText: nil,
                textForm: .init(
                    placeholder: "Password",
                    isSecureTextEntry: true
                )
            )
        ]
    ),
    ButtonSection(
        buttonTitle: "Login",
        action: .handler({
            print("Login button pressed")
        })
    )
]
reloadSections()

public protocol SectionProvider: AnyObject {
    var sections: [CollectionViewSection] { get }
    func section(for sectionIndex: Int) -> CollectionViewSection
}

override func viewDidLoad() {
    super.viewDidLoad()
    ...
    provider = // assign your provider e.g. presenter in VIPER
    ...
}