SwiftUI。自定义绑定值发生变化时如何通知？

import SwiftUI

struct ContentView: View {
    @State private var count = 0
    
    var body: some View {
        VStack {
            Text("Count: \(count)")
            
            Button("Increment") {
                count += 1
            }
        }
        .onAppear {
            // 在视图出现时执行的操作
            print("View appeared")
        }
        .onChange(of: count) { newValue in
            // 当count值发生变化时执行的操作
            print("Count changed to \(newValue)")
        }
    }
}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}