Sample `ContentView` using `RandomNumberViewModel`.

content_view.swift

struct ContentView: View {
	@ObservedObject var viewModel = RandomNumberViewModel()

	var body: some View {
		Button(
			action: viewModel.randomNumberPing.send, /// (1) Pipe button taps over to our view model’s `PassthroughSubject`.
			label: { Text("Fetch a random number.") }
		)
		.disabled(viewModel.dataLoadState.isLoading)
		.sheet(isPresented: viewModel.modalShown) {
			view(for: self.viewModel.dataLoadState)
		}
	}
}

private func view(for dataLoadState: DataLoadState<Int, RandomDotOrgError>) -> some View {
	switch dataLoadState {
	case let .loaded(randomNumber):
		return Text("\(randomNumber)")
	case .error:
		return Text("An error occured or an odd was returned!")
	case .initial, .loading:
		fatalError("We shouldn’t be displaying a modal in these cases.")
	}
}