SwiftUI / Firebase:我可以使用@Published向Firebase数据库发送和接收单个值吗？

class MyViewModel: ObservableObject {
    @Published var value: String = ""
}

struct ContentView: View {
    @ObservedObject var viewModel = MyViewModel()
    
    var body: some View {
        // Your view code here
    }
}

struct ContentView: View {
    @ObservedObject var viewModel = MyViewModel()
    
    var body: some View {
        TextField("Enter value", text: $viewModel.value)
            .padding()
    }
}

import Firebase

struct ContentView: View {
    @ObservedObject var viewModel = MyViewModel()
    
    var ref: DatabaseReference = Database.database().reference()
    
    var body: some View {
        TextField("Enter value", text: $viewModel.value)
            .padding()
            .onReceive(viewModel.$value) { newValue in
                ref.child("myValue").setValue(newValue)
            }
            .onAppear {
                ref.child("myValue").observe(.value) { snapshot in
                    if let value = snapshot.value as? String {
                        viewModel.value = value
                    }
                }
            }
    }
}