如何在macOS上检测SwiftUI中的键盘事件？

import SwiftUI

struct ContentView: View {
    @State private var keyPressed = ""

    var body: some View {
        Text("Last Key Pressed: \(keyPressed)")
            .padding()
            .onReceive(NotificationCenter.default.publisher(for: NSApplication.keyDownEvent), perform: { (notification) in
                guard let event = notification.userInfo?["event"] as? NSEvent else { return }
                guard let key = event.charactersIgnoringModifiers else { return }
                keyPressed = key
            })
    }
}

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