SwiftUICollectionViewCell, SwiftUIView embed in UICollectioViewCell

SwiftUICollectionViewCell.swift

import SwiftUI
import UIKit


/// Subclass for embedding a SwiftUI View inside of UICollectionViewCell
open class SwiftUICollectionViewCell: UICollectionViewCell {

    static var reuseIdentifier: String {
        "\(self)"
    }

    /// Controller to host the SwiftUI View
    private(set) var host: UIHostingController<AnyView>?
    private(set) var onPrepareForReuse: (() ->())? = nil

    // MARK: Initializers

    deinit {
        host?.willMove(toParent: nil)
        host?.view.removeFromSuperview()
        host?.removeFromParent()
        host = nil
    }

    // MARK: Public methods

    /// Add host controller to the heirarchy
    /// - Parameters:
    ///   - parent: Parent UIViewController
    ///   - content: View Content
    ///   - viewModel: ViewModel of `ReusableSwiftUICollectionViewModelCell` for `prepareForReuse`,
    ///
    /// **Note:**
    /// - **In the case creation instance**: The `appear` method of `SwitfUI` is called once at the creation instance.
    ///
    /// - **In the case of reuse**: The `appear` method is not called because `UIHostingController` already appeared (Reusable cell).
    ///                       The method `onPrepareForReuse` will give you the indication of a reuse of the cell.
    ///                       (like `PrepareForReuse` of `collectionViewCell`)
    ///
    public func configure(
        parent: UIViewController,
        view content: AnyView,
        inset: EdgeInsets = .zero,
        onPrepareForReuse: (() ->())? = nil
    ) {
        self.onPrepareForReuse = onPrepareForReuse
        let contentConfigured = content.padding(inset).eraseToAnyView()
        
        if let host = host {
            host.rootView = contentConfigured
            host.view.layoutIfNeeded()

        } else {
            let host = UIHostingController(rootView: contentConfigured)
            parent.addChild(host)
            host.didMove(toParent: parent)
            contentView.addSubview(host.view)
            host.view.frame = contentView.bounds
            host.view.backgroundColor = .clear
            host.view.bindFrameToSuperviewBounds()
            
            self.host = host
        }
    }
    
    open override func prepareForReuse() {
        super.prepareForReuse()
        self.onPrepareForReuse?()
    }
}