SwiftUI BIG list search

问题

Hello i'm try to search an airport in a big list of item create from an Array called airportVector of type AirportModel, but when I try to lunch the search as soon I type the first letter everything block! looks like the list is too big .

if I leave only few item the list work.

I tried to make my model conform to Equatable and Hashable but i'm not to expert how to use it.. look for some help or suggestion how to avoid the block.

here my model

import Foundation

class AirportModel : Identifiable , Codable, Equatable, Hashable {

    var id : UUID = UUID()
    var aptICAO : String
    var aptName : String
    var aptCity : String
    var aptCountry :String
    var aptIATA : String

    func hash(into hasher: inout Hasher) {
           hasher.combine(aptICAO)
       }

init(aptICAO: String, aptName: String, aptCity: String, aptCountry: String, aptIATA: String) {
    self.aptICAO = aptICAO
    self.aptName = aptName
    self.aptCity = aptCity
    self.aptCountry = aptCountry
    self.aptIATA = aptIATA
}

    static func == (lhs: AirportModel,rhs: AirportModel) -> Bool{
        return lhs.aptICAO == rhs.aptICAO
    }


}

here my View with the searcher

import SwiftUI

struct AirportView: View{
    @ObservedObject var dm: DataManager
    @State private var searchTerm : String = ""
    var airport : AirportModel
    @Binding var dismissFlag: Bool


    var body: some View {
        VStack {
//            fakebar
                SearchBar(text: $searchTerm)
            List{

                ForEach(dm.airportVector.filter{
//                    self.searchTerm.isEmpty ? true :
                        $0.aptICAO.localizedCaseInsensitiveContains(searchTerm)
                }, id: \.self){ item in
                    Text(item.aptICAO)
                }
            }
        }
    }
    // bar for Airport List
    var fakebar: some View {
        ZStack {
            HStack {

                Spacer()

                Image(systemName: "chevron.compact.down")
                    .font(.system(size: 60))
                    .aspectRatio(contentMode: .fit)
                    .foregroundColor(.white)

                Spacer()
            }

            HStack {
                Spacer()
                Button(action: {
                    self.dismissFlag.toggle()
                }) {
                    Text("Chiudi")
                        .fontWeight(.bold)
                        .foregroundColor(.white)
                        .padding(.horizontal)
                }
            }
        }
        .frame(height: 44)
        .background(Color.red.padding(.top, -44))
    }
}

I create my vector at the first star of the app using the below function, (using a file json)

 func openfilejson (fileName : String, completition: completition) {
        if let path = Bundle.main.path(forResource: fileName, ofType: "json") {
            do {
                let fileUrl = URL(fileURLWithPath: path)
                let datafile = try Data(contentsOf: fileUrl,options: .mappedIfSafe)
                let json = JSON(data:datafile)

                for (key,_) in json {

                    let airport = AirportModel(aptICAO: "", aptName: "", aptCity: "", aptCountry: "", aptIATA: "")
                    airport.aptName = json[key]["name"].stringValue
                    airport.aptCity = json[key]["city"].stringValue
                    airport.aptCountry = json[key]["country"].stringValue
                    airport.aptIATA = json[key]["iata"].stringValue
                    airport.aptICAO = json[key]["icao"].stringValue

                    airportVector.append(airport)

                }

            } catch {
                 print("ERRORE OPEN FILE AEROPORTI")
            }

        }
        saveAirportVector()
        completition()
    }

thanks for the help, look for some way to speed up the list Thanks

来源：https://stackoverflow.com/questions/59580088/swiftui-big-list-search