An approach for simplified wrapping of AppKit and UIKit views in SwiftUI

SwiftUI WrapView coordinator protocol approach.swift

protocol ViewWrapper {
    associatedtype ViewType: OSView
    typealias Context = OSViewRepresentableContext<WrapView<Self>>
    func makeView(_ context: Context) -> ViewType
    func updateView(_ view: ViewType, _ context: Context)
    func wrapped() -> WrapView<Self>
}

struct WrapView<Wrapper: ViewWrapper>: OSViewRepresentable {
    let wrapper: () -> Wrapper

    internal func makeCoordinator() -> Wrapper {
        return wrapper()
    }

    #if os(macOS)
    internal func makeNSView(context: NSViewRepresentableContext<WrapView>) -> Wrapper.ViewType {
        context.coordinator.makeView(context)
    }
    internal func updateNSView(_ view: Wrapper.ViewType, context: NSViewRepresentableContext<WrapView>) {
        context.coordinator.updateView(view, context)
    }

    #elseif os(iOS)
    internal func makeUIView(context: NSViewRepresentableContext<WrapView>) -> Wrapper.ViewType {
        context.coordinator.makeView(context)
    }
    internal func updateUIView(_ view: Wrapper.ViewType, context: NSViewRepresentableContext<WrapView>) {
        context.coordinator.updateView(view, context)
    }
    #endif
}