SwiftUI—如何使列表同时支持删除和移动记录的功能

struct ContentView : View {
    @State var languages = ["Objective-C", "Swift", "Flutter"]
    var body: some View {
        NavigationView {
            List {
                ForEach(languages, id: \.self) { language in
                    Text(language)
                }
                .onDelete(perform: deleteItem)
                .onMove(perform: moveItem)
            }
            .navigationBarTitle(Text("Edit Row"), displayMode: .large)
            .navigationBarItems(trailing: EditButton())
        }
    }
    func deleteItem(at offsets: IndexSet) {
        if let first = offsets.first {
            languages.remove(at: first)
        }
    }
    func moveItem(from source: IndexSet, to destination: Int) {
        languages.move(fromOffsets: source, toOffset: destination)
    }
}