Custom SwiftUI Modal

public class RootViewController<Content: View>: UIHostingController<Content> {
    public init(view: Content, rootViewManager: RootViewManager) {
        super.init(rootView: view)

        rootViewManager.rootViewController = self
    }

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

extension RootViewController where Content: HostableView {
    public convenience init(view: Content) {
        self.init(view: view, rootViewManager: view.rootViewManager)
    }
}

public class RootViewManager: NSObject {
    weak var rootViewController: UIViewController?

    public var isDismissEnabled: Bool {
        get {
            !(rootViewController?.isModalInPresentation ?? false)
        }
        set {
            rootViewController?.isModalInPresentation = !newValue
        }
    }

    public func showModal<Content: HostableView>(_ view: Content,
                                                 completion: @escaping () -> Void = {}) {
        let modalViewController = RootViewController(view: view)
        rootViewController?.present(modalViewController, animated: true, completion: completion)
    }
    
    public func showModal<Content: View>(_ view: Content,
                                         rootViewManager: RootViewManager,
                                         completion: @escaping () -> Void = {}) {
        let modalViewController = RootViewController(view: view, rootViewManager: rootViewManager)
        rootViewController?.present(modalViewController, animated: true, completion: completion)
    }
}

public protocol HostableView: View {
    var rootViewManager: RootViewManager { get }
}

struct RootView: View, HostableView {
    @ObservedObject var rootViewManager = RootViewManager() // This is passed down as an environment object to all relevant children

    var body: some View { ... }
    
    private func buttonTapped() {
        self.rootViewManager.showModal(SomeView())
    }
}