CountView.swift

struct CountView: UIViewControllerRepresentable {

    @EnvironmentObject var counter: ObservableCounter

    typealias UIViewControllerType = CountViewController

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

    func updateUIViewController(_ uiViewController: CountViewController, context: Context) {
        uiViewController.count = counter.count
    }
}