使用SwiftUI时，TextField始终位于键盘顶部

import SwiftUI
import Combine

struct ContentView: View {
    @State private var text: String = ""
    @State private var keyboardHeight: CGFloat = 0
    
    var body: some View {
        VStack {
            TextField("Enter text", text: $text)
                .padding()
                .background(Color.gray)
                .cornerRadius(5)
                .padding()
        }
        .padding()
        .onReceive(Publishers.keyboardHeight) { self.keyboardHeight = $0 }
        .animation(.easeOut(duration: 0.25))
        .padding(.bottom, keyboardHeight)
    }
}

extension Publishers {
    static var keyboardHeight: AnyPublisher<CGFloat, Never> {
        let willShow = NotificationCenter.default.publisher(for: UIResponder.keyboardWillShowNotification)
            .map { $0.keyboardHeight }
        
        let willHide = NotificationCenter.default.publisher(for: UIResponder.keyboardWillHideNotification)
            .map { _ in CGFloat(0) }
        
        return MergeMany(willShow, willHide)
            .eraseToAnyPublisher()
    }
}

extension Notification {
    var keyboardHeight: CGFloat {
        return (userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect)?.height ?? 0
    }
}