如何使用相同的时钟视图显示不同的时区？Swiftui

import SwiftUI

struct ContentView: View {
    @State private var currentDate = Date()
    @State private var selectedTimeZone = TimeZone.current
    
    var body: some View {
        VStack {
            Text("当前时间：")
            Text(currentDate, formatter: dateFormatter)
            
            Picker("选择时区", selection: $selectedTimeZone) {
                ForEach(TimeZone.knownTimeZoneIdentifiers, id: \.self) { identifier in
                    Text(identifier)
                        .tag(TimeZone(identifier: identifier))
                }
            }
            .labelsHidden()
            
        }
        .padding()
        .onAppear {
            // 更新当前时间
            updateCurrentDate()
        }
        .onChange(of: selectedTimeZone) { _ in
            // 选择时区变化时更新当前时间
            updateCurrentDate()
        }
        .environment(\.timeZone, selectedTimeZone)
    }
    
    private var dateFormatter: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd HH:mm:ss"
        return formatter
    }
    
    private func updateCurrentDate() {
        currentDate = Date()
    }
}

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