显示1秒后自动关闭modal swiftui

import SwiftUI

struct ContentView: View {
    @State private var showModal = true
    
    var body: some View {
        VStack {
            Text("Hello, World!")
                .padding()
            
            Button("Show Modal") {
                showModal = true
            }
        }
        .sheet(isPresented: $showModal) {
            ModalView()
        }
        .onAppear {
            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                showModal = false
            }
        }
    }
}

struct ModalView: View {
    var body: some View {
        VStack {
            Text("Modal Content")
                .font(.title)
                .padding()
            
            Button("Close") {
                // Close the modal
                dismiss()
            }
        }
    }
    
    private func dismiss() {
        // Dismiss the modal
    }
}