如何在SwiftUI中过滤多个列表视图

问题描述

我不熟悉编码，一直在尝试使用SwiftUI构建我的第一个iPhone应用程序，因此请原谅我的问题和代码中的任何错误。 我已经成功地从json文件中解析了数据，并且能够在2个列表视图和最终的详细视图中显示数据。我现在正在尝试过滤3个列表，以使汽车的品牌不在第一个列表中重复，相应汽车的型号不在第二个列表中重复，并且相应汽车的徽章也不再重复第三个列表。Make screenshot，Model screenshot，Detail screenshot。

如果问题过于笼统，我深表歉意，并且我很欣赏可能有很多方法可以完成我想做的事情。我也很高兴能为所建议的任何资源指明正确的方向，以便我可以更好地理解这种数据管理类型。

谢谢。

JSON代码段

    [
  {
    "id": 1,"make": "Alfa Romeo","model": "147","badge": "Twin Spark","series": null,"year": 2004,"fuel": "Petrol","driveType": "2WD","bodyType": "Small Hatch","transmission": "Automatic","manualDeduction": -250,"subtraction1": null,"subtraction1Difference": 0,"add1": "Sunroof","add1Difference": 250,"add2": null,"add2Difference": 0,"add3": null,"add3Difference": 0,"add4": null,"add4Differnece": 0,"avgAnnualKms": 15000,"age": 16,"averageKmsForYear": 240000,"priceWhenNew": 0,"depreciationForKms": 0,"algorithmValuation": 0,"valuerValuation": 500,"valo": 500,"logoName": "Alfa"
  },{
    "id": 2,"model": "156","badge": "JTS","bodyType": "Sedan","valuerValuation": 1000,"valo": 1000,

数据：

import Foundation

func JsonParse() -> [VehicleData]{
    guard let url = Bundle.main.url(forResource: "vehicleValuationData",withExtension: "json")
    else {
        fatalError("Failed to locate in bundle")
    }
    guard let data = try? Data(contentsOf: url)
    else {
        fatalError("Failed to locate in bundle")
    }
    guard let loaded = try? JSONDecoder().decode([VehicleData].self,from: data) else {
        fatalError("Failed to decode from bundle")
    }
    return loaded
}

struct VehicleData: Codable,Identifiable{
    let id: Int
    let make: String
    let model,badge: String
    let series: String?
    let year: Int
    let fuel: String
    let driveType: String
    let bodyType: String
    let transmission: String
    let manualDeduction: Int
    let subtraction1: String?
    let subtraction1Difference: Int
    let add1: String?
    let add1Difference: Int
    let add2: String?
    let add2Difference: Int
    let add3: String?
    let add3Difference: Int
    let add4: String?
    let add4Differnece,avgAnnualKms,age,averageKmsForYear: Int
    let priceWhenNew: Int
    let depreciationForKms,algorithmValuation: Double
    let valuerValuation: Int
    let valo: Double
    let logoName: String
}

MakeCarView视图。

   import SwiftUI

struct MakeCarView: View {
    var body: some View {
        NavigationView{
            List(JsonParse()) { car in
                MakeCellRow(car: car)
            }.navigationTitle("Make")
        }
    }
}
struct MakeCellRow: View {
    var car: VehicleData
    var body: some View {
        HStack {
            NavigationLink(destination: ModelView()) {
                Image(car.logoName)
                    .resizable()
                    .aspectRatio(contentMode: .fit)
                    .frame(width: 60,height: 60,alignment: .center)
                    .padding()
                Text(car.make)
                    .font(.title2)
            }
            .background(Color("card color"))
            .cornerRadius(15)
            .shadow(color: Color.black.opacity(0.25),radius: 3,x: 0,y: 0)
        }
    }
}
struct MakeCarViewsPreview: PreviewProvider {
    static var previews: some View {
        Group {
            MakeCarView()
        }
    }
}

解决方法

暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！

如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。

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