SwiftUI - How to access UIHostingController from SwiftUI

Question

I have SwiftUI page, it's being navigated from UIKit view. I want to set a title to this page, what I'm doing is

// code of UIKit view
let controller = UIHostingController(rootView: SwiftUIView())
controller.title = "title"
MyNavigationManager.present(controller)

Is there a way I can access the hosting controller within SwiftUI?

Then I could write code like self.hostingController?.title = "title"

Answer 1

Here is a demo of possible approach - to use external configuration wrapper class to hold weak link to controller and inject it into SwiftUI view (as alternate it is also possible to make it ObservableObject to combine with other global properties and logic).

Tested with Xcode 12.5 / iOS 14.5

class Configuration {
    weak var hostingController: UIViewController?    // << wraps reference
}

struct SwiftUIView: View {
    let config: Configuration   // << reference here

    var body: some View {
        Button("Demo") {
            self.config.hostingController?.title = "New Title"
        }
    }
}

let configuration = ExtConfiguration()
let controller = UIHostingController(rootView: SwiftUIView(config: configuration))

// injects here, because `configuration` is a reference !!
configuration.hostingController = controller

controller.title = "title"
MyNavigationManager.present(controller)