Playground.swift

import Foundation
import UIKit

enum WidgetType {
    case search
    case banner
}

class Interactor {
    func buildWidgets() {
        let widgets = [WidgetType]()
        widgets.append(.search)
        presenter.present(widgets)
    }
}

class Presenter {
    func present(_ widgets: [WidgetType]) {
        viewController.display(widgets)
    }
}

protocol Widgetable: UIView {
    var widgetType: WidgetType { get }
}

class SearchWidgetView: UIView, Widgetable {
    var widgetType: WidgetType = .search
    var onTap: (() -> Void)?
    var onTimeIntent: (() -> Void)?
}

struct Banner { }

class BannerWidgetView: UIView, Widgetable {
    var widgetType: WidgetType = .banner
    var onTap: ((Banner) -> Void)?
}

class ViewController {
    let searchWidget: SearchWidgetView = .init()
    let bannerWidget: BannerWidgetView = .init()
    
    let stackView: UIStackView = .init()
    
    var allWidgets: [Widgetable] {
        [
            searchWidget,
            bannerWidget
        ]
    }
    
    func display(widgets: [WidgetType]) {
        allWidgets
            .filter { widgets.contains($0.widgetType) }
            .forEach { stackView.addArrangedSubview($0) }
    }
    
    func viewDidLoad() {
        searchWidget.onTap = { }
        searchWidget.onTimeIntent = { }
        
        bannerWidget.onTap = { banner in }
    }
}