SwiftUI integration with UIKit/AppKit: Coordinators

[fespinoza]

A SwiftUI view that represents a UIKit view controller can define a Coordinator type that SwiftUI manages and provides as part of the representable view’s context.

You can use this coordinator to implement common Cocoa patterns, such as delegates, data sources, and responding to user events via target-action.

import SwiftUI
import UIKit

struct PageViewController: UIViewControllerRepresentable {
    var controllers: [UIViewController]

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    func makeUIViewController(context: Context) -> UIPageViewController {
        let pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal)
        return pageViewController
    }

    func updateUIViewController(_ pageViewController: UIPageViewController, context: Context) {
        pageViewController.setViewControllers([controllers[0]], direction: .forward, animated: true)
    }

    class Coordinator: NSObject {
        var parent: PageViewController

        init(_ pageViewController: PageViewController) {
            self.parent = pageViewController
        }
    }
}

UIViewRepresentable
UIViewControllerRepresentable
NSViewRepresentable
NSViewControllerRepresentable

UIHostingController

Source: Interfacting with UIKit - Apple