A generic class for hosting a SwiftUI.View in a collection view cell.

HostingCollectionViewCell.swift

protocol HasEmptyInitializer {
    init()
}

class HostingCollectionViewCell<Content, Model>: UICollectionViewCell where Content: View, Content: HasEmptyInitializer, Model: ObservableObject, Model: HasEmptyInitializer {

    private lazy var view: Content = { Content() }()
    lazy var model: Model = { Model() }()
    lazy var hostingController: some UIViewController = { UIHostingController(rootView: view.environmentObject(model)) }()

    override init(frame: CGRect) {
        super.init(frame: .zero)

        backgroundColor = .clear
        hostingController.view.backgroundColor = .clear
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func setupIfNeeded(in container: UIViewController) {
        guard hostingController.parent == nil else { return }

        container.addChild(hostingController)
        contentView.addSubview(hostingController.view)
        hostingController.view.pinEdges()
        hostingController.didMove(toParent: container)
    }

    deinit {
        guard hostingController.parent != nil else { return }

        hostingController.willMove(toParent: nil)
        hostingController.view.removeFromSuperview()
        hostingController.removeFromParent()
    }
}