UIKit+SwiftUIPreview.swift

#if canImport(swiftUI) && DEBUG
import UIKit
import SwiftUI

/// This is a UIKit preview in SwiftUI extension
/// With this extension, you will have a `.preview` property to get a swift ui preview view
@available(iOS 13.0, *)
extension UIViewController {

    private struct Preview: UIViewControllerRepresentable {

        let viewController: UIViewController

        func makeUIViewController(context: Context) -> UIViewController {
            viewController
        }

        func updateUIViewController(_ uiViewController: UIViewController, context: Context) { /* no-op */ }
    }

    public var preview: some View {
        return Preview(viewController: self)
    }
}
#endif

// MARK: - Example code

// MARK: - View Controller

// #if canImport(swiftUI) && DEBUG
// import SwiftUI
// @available(iOS 13.0, *)
// struct <#ViewControllerYouWouldLikeToPreview#>_Preview: PreviewProvider {
//     static var previews: some View {
//         <#ViewControllerYouWouldLikeToPreview#>().preview
//     }
// }
// #endif