UIViewControllerRepresentable - “非最终类不能满足协议” - SwiftUI

Question

Not sure if I'm missing something or found a SwiftUI bug. This is such a simple thing and it's driving me crazy.

Trying to setup a UIViewControllerRepresentable but getting the following errors:

Protocol 'View' requirement '_makeView(view:inputs:)' cannot be satisfied by a non-final class ('VideoAnswerWrapper') because it uses 'Self' in a non-parameter, non-result type position

Protocol 'View' requirement '_makeViewList(view:inputs:)' cannot be satisfied by a non-final class ('VideoAnswerWrapper') because it uses 'Self' in a non-parameter, non-result type position

I've tried:

• Switching the 'VideoAnswerViewController' for 'VideoAnswerWrapper.UIViewControllerType'
• Restarting Xcode, clearing caches, derived data, etc.
• Starting with a blank ViewController to ensure it's not a weird storyboard issue
• Switching down an Xcode version as well as trying the 11.4 beta.
• Different ways of instantiating the VideoAnswerViewController
• Adding 'final' to the class

Here is my UIViewControllerRepresentable class:

import SwiftUI

class VideoAnswerWrapper: UIViewControllerRepresentable {
    
    typealias UIViewControllerType = VideoAnswerViewController

    private var question : Question!


    init(question: Question?) {
        guard let question = question else {fatalError()}
        self.question = question
    }

    func makeUIViewController(context: UIViewControllerRepresentableContext<VideoAnswerWrapper>) -> VideoAnswerViewController {

        let storyboard = UIStoryboard(name: "VideoAnswer", bundle: .main)

        //Downcast returned controller to the requried type
        guard let viewController = storyboard.instantiateInitialViewController() as? VideoAnswerViewController else { fatalError() }

        //Assign selected question object to instance property on incoming viewController.
//        viewController.question = question

        return viewController
    }

    func updateUIViewController(_ uiViewController: VideoAnswerViewController, context: UIViewControllerRepresentableContext<VideoAnswerWrapper>) {
        
    }
}

UIViewController (I've stripped all the functionality to isolate the bug)

import UIKit

class VideoAnswerViewController: UIViewController {

}

Answer 1

class VideoAnswerWrapper: UIViewControllerRepresentable { typealias UIViewControllerType = VideoAnswerViewController

The above intended to present a SwiftUI View so MUST be a struct as below

struct VideoAnswerWrapper: UIViewControllerRepresentable {

    typealias UIViewControllerType = VideoAnswerViewController