1. import SwiftUI
2. UIViewControllerRepresentable 채택

struct ViewControllerRepresentable: UIViewControllerRepresentable {
    typealias UIViewControllerType = ViewController

    func makeUIViewController(context: Context) -> ViewController {
        return ViewController()
    }

    func updateUIViewController(_ uiViewController: ViewController, context: Context) { 
    }
}

1. Canvas Preview 넣어주기

@available(iOS 13.0.0, *)
struct ViewPreview: PreviewProvider {
    static var previews: some View {
        ViewControllerRepresentable()
    }
}

https://velog.io/@lina0322/iOSSwift-코드만-UI-구현하기-part.0-preview-canvas-세팅하기