Update SwiftUI EditMode from UIKit

ViewController.swift

//
//  ViewController.swift
//  EditButtonExample
//
//  Created by Chris Brind on 31/08/2022.
//

import UIKit
import SwiftUI
import Combine

// Assumes this ViewController is on a UINavigationViewController stack
class ViewController: UIHostingController<ExampleListView> {

    let model = ExampleListModel()

    var cancellables = Set<AnyCancellable>()

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder, rootView: ExampleListView(model: model))

        // This lets us update our UIKit layer when the user swipes to delete an item when not in edit mode
        model.$editMode.sink { newEditMode in
            if newEditMode == .transient {
                self.setupDoneButton()
            }
        }.store(in: &cancellables)

    }

    override func viewDidLoad() {
        super.viewDidLoad()
        setupEditButton()
    }

    @IBAction func onEdit() {
        model.editMode = EditMode.active
        setupDoneButton()
    }

    @IBAction func onDone() {
        model.editMode = EditMode.inactive
        setupEditButton()
    }

    private func setupEditButton() {
        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .edit, target: self, action: #selector(onEdit))
    }

    private func setupDoneButton() {
        navigationItem.rightBarButtonItem = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(onDone))
    }

}

class ExampleListModel: ObservableObject {

    @Published var editMode: EditMode = .inactive

}

struct ExampleListView: View {

    @ObservedObject var model: ExampleListModel

    let items = ["Hello", "World"]

    var body: some View {
        List {
            Section("Won't show delete prompts") {
                Text("Example 1")
            }

            Section("Can be deleted") {
                ForEach(items, id: \.self) { item in
                    Text(item)
                }.onDelete { indexSet in
                    print("onDelete", indexSet)
                }
            }
        }
        // Bind the edit mode environment variable to our model so we can change it from UIKit
        .environment(\.editMode, $model.editMode)
    }

}