swift - 类型不符合协议(protocol) 'Decodable'/'Encodable'

Question

我有以下数据类，我尝试向其添加一个 AdditionalCharge 数组，但出现标题中指定的错误。

包含额外费用的 AdditionalCharge 类和 FundingRequest 类如下。

我不确定我做错了什么。

class AdditionalCharge{
    var ItemDescription = ""
    var ItemValue:String = ""
}

class FundingRequest: Codable {
let dispatcherName, loadReference, origin, destination: String
let userID: String, applicationID: String
let pickedUp, droppedOff: String
let driverFirstName, driverLastName: String
let grossTruckPay,fundingMethod, comments: String
let advancesTaken: Bool
let rateConfirmation, billOfLading, lumperReceipt: [String]
let salesTicket: [String]
let debtorID: String
let additionalCharges = [AdditionalCharge]()
enum CodingKeys: String, CodingKey {
    case dispatcherName = "DispatcherName"
    case loadReference = "LoadReference"
    case origin = "Origin"
    case destination = "Destination"
    case userID = "UserID"
    case applicationID = "ApplicationID"
    case pickedUp = "PickedUp"
    case droppedOff = "DroppedOff"
    case driverFirstName = "DriverFirstName"
    case driverLastName = "DriverLastName"
    case grossTruckPay = "GrossTruckPay"
    case advancesTaken = "AdvancesTaken"
    case fundingMethod = "FundingMethod"
    case comments = "Comments"
    case additionalCharges = "AdditionalCharges"
    case rateConfirmation = "RateConfirmation"
    case billOfLading = "BillOfLading"
    case lumperReceipt = "LumperReceipt"
    case salesTicket = "SalesTicket"
    case debtorID = "DebtorID"
}

init(dispatcherName: String, loadReference: String, origin: String, destination: String, userID: String,applicationID: String, pickedUp: String, droppedOff: String, driverFirstName: String, driverLastName: String, grossTruckPay: String, advancesTaken: Bool, fundingMethod: String, comments: String, additionalCharges: [AdditionalCharge], rateConfirmation: [String], billOfLading: [String], lumperReceipt: [String], salesTicket: [String], debtorID:String) {
    self.dispatcherName = dispatcherName
    self.loadReference = loadReference
    self.origin = origin
    self.destination = destination
    self.userID = userID
    self.pickedUp = pickedUp
    self.droppedOff = droppedOff
    self.driverFirstName = driverFirstName
    self.driverLastName = driverLastName
    self.grossTruckPay = grossTruckPay
    self.advancesTaken = advancesTaken
    self.fundingMethod = fundingMethod
    self.comments = comments
    self.additionalCharges = additionalCharges
    self.rateConfirmation = rateConfirmation
    self.billOfLading = billOfLading
    self.lumperReceipt = lumperReceipt
    self.salesTicket = salesTicket
    self.debtorID = debtorID
    self.applicationID = applicationID
}

Answer 1

Codable 类型中的每个属性也必须是Codable。

The simplest way to make a type codable is to declare its properties using types that are already Codable.

1. Built-in Codable types — String, Int, Double, Data, URL Array,

2. Dictionary, Optional are Codable if they contain Codable types

因此，AdditionalCharge 也必须是 Codable 才能使 FundingRequest 成为 Codable。

class AdditionalCharge: Codable {
    var ItemDescription = ""
    var ItemValue:String = ""
}