SwiftUI -如何在表单中添加“字母部分”和字母跳转？

import SwiftUI

struct ContentView: View {
    let contacts = ["Alice", "Bob", "Charlie", "David", "Eve", "Frank", "Grace", "Henry", "Ivy", "Jack", "Kate", "Liam", "Mia", "Noah", "Olivia", "Peter", "Quinn", "Ryan", "Sophia", "Tom", "Ursula", "Victor", "Wendy", "Xavier", "Yvonne", "Zoe"]
    
    var body: some View {
        NavigationView {
            List {
                ForEach(contacts, id: \.self) { contact in
                    Text(contact)
                }
            }
            .navigationBarTitle("Contacts")
            .listStyle(GroupedListStyle())
            .indexStyle(.automatic) // 添加字母索引
        }
    }
}

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