筛选和选择选择器值 SwiftUI

如何解决筛选和选择选择器值 SwiftUI

我正在构建一个旅行计划应用，让用户可以从本地 json 文件中选择一个城市。

我可以显示和过滤列表（使用选择器），但我不知道如何读取和存储选择。

任何帮助将不胜感激。

型号

import Foundation

struct Destination: Codable,Hashable,Identifiable {
    
    var id: Int
    let city: String
    let country: String
    
}

选择器视图

import SwiftUI

struct AddTripView: View {

    let cities = Bundle.main.decode([Destination].self,from: "cities.json")
    @State private var selectedCity = 0
    @State var searchText = ""

       var body: some View {
        
            Form {
                Section {
                    Picker(selection: $selectedCity,label: Text("Select city")) {
                        
                        SearchBar(text: $searchText)
 
                        ForEach(cities.filter {searchText.isEmpty ? true : $0.city.lowercased().hasPrefix(searchText.lowercased())},id: \.self) {
                            
                            Text($0.city)
                        }
                    }
                }
            }.navigationBarTitle("Create trip")
            
        }
}

struct AddTripView_Previews: PreviewProvider {
    static var previews: some View {
        AddTripView()
    }
}

JSON 示例

[{
    "id": 1,"city": "Zaranj","country": "Afghanistan"
  },{
    "id": 2,"city": "Taloqan",{
    "id": 3,"city": "Shīnḏanḏ",{
    "id": 4,"city": "Shibirghān",{
    "id": 5,"city": "Shahrak","country": "Afghanistan"
  }]