Custom View Implementation for iOS

ViewRenderable.swift

import UIKit

protocol ViewCustomized {
    func createView<T>(_ viewClass: T.Type, parentView: UIView) -> T where T: UIView, T: ViewRenderable
}

protocol ViewRenderable {
    func render()
}

extension ViewCustomized {
    func createView<T>(_ viewClass: T.Type, parentView: UIView)
        -> T where T: UIView, T: ViewRenderable {
            let v = viewClass.init(frame: parentView.bounds)
            v.autoresizingMask = [.flexibleWidth, .flexibleHeight]
            parentView.addSubview(v)
            v.render()
            
            return v
    }
}

WebsiteListView.swift

class WebsitesListView: UIView {
    private enum ViewConstants {
        static let cellIdentifier = "cellIdentifier"
    }

    var viewData: WebsitesListViewData?
  
}

extension WebsitesListView: ViewRenderable {
    func render() {
        self.backgroundColor = UIColor.clear
        // Similar things like below. Create views and add them using the WebsiteListView with using auto-layout
        // self.tableView = createTableView()
        // self.refreshControl = createRefreshControl()
    }
}

WebsiteListViewController.swift

class WebsitesListViewController: UIViewController, ViewCustomized, AlertDisplayable {
    private let viewModel: WebsitesListViewModel
    private var websitesListView: WebsitesListView!

    init(viewModel: WebsitesListViewModel) {
        self.viewModel = viewModel

        super.init(nibName: nil, bundle: nil)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func viewDidLoad() {
        super.viewDidLoad()

        self.websitesListView = createView(WebsitesListView.self,
                                           parentView: view)
        websitesListView.viewData = viewModel
    }
}

WebsiteListViewModel.swift

protocol WebsitesListViewData: WebsiteNameTableViewCellData {
    func numberOfRows() -> Int
    func website(at indexPath: IndexPath) -> Website
}

class WebsitesListViewModel {
    var websites: [Website]

    init(websites: [Website]) {
        self.websites = websites
    }
}

extension WebsitesListViewModel: WebsitesListViewData {
    func numberOfRows() -> Int {
        return websites.count
    }

    func website(at indexPath: IndexPath) -> Website {
        return websites[indexPath.row]
    }
}