如何在键盘打开时停止GeometryReader更改值

import SwiftUI

struct ContentView: View {
    @State private var keyboardHeight: CGFloat = 0
    
    var body: some View {
        VStack {
            // Your content here
            
        }
        .padding()
        .onAppear {
            NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillShowNotification, object: nil, queue: .main) { notification in
                guard let keyboardFrame = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect else { return }
                self.keyboardHeight = keyboardFrame.height
            }
            
            NotificationCenter.default.addObserver(forName: UIResponder.keyboardWillHideNotification, object: nil, queue: .main) { _ in
                self.keyboardHeight = 0
            }
        }
        .onDisappear {
            NotificationCenter.default.removeObserver(self)
        }
    }
}

GeometryReader { geometry in
    // Your content here
}
.frame(height: geometry.size.height - keyboardHeight)