PROSAGA码农传奇-IOS-类型'MenuItem'不符合协议'可解码'

<div class =“post-text”itemprop =“text”>
  <P>
    你需要使内部结构符合
     <code>
      Decodable
    </code>
    /
     <code>
      Codable
    </code>
     还要删除struct
     <code>
      init
    </code>
     它会自动生成
  </p>
   <pre>
    <code>
      struct Modifier: Codable {
    // add properties 
} 
struct MenuItem: Codable {

let itemId: String
    let name: String
    var modifiers: [Modifier]?
    var photoUrl: String?
    var quantity: Int
    var unitPrice: Int
    var sizeAddOnPrice: Int
    var toppingsAddOnPrice: Int
    var totalPrice: Int
    var totalModifiersPrice: Int
    let description: String
    var size: String
    var toppings: [String]?
    let category: String

init?(itemId: String, payload: JSON) {
        guard
            let name = payload[ParamKey.name].string,
            let photoUrl = payload[ParamKey.photoUrl].string,
            let description = payload[ParamKey.description].string,
            let category = payload[ParamKey.categoryName].string,
            let unitPrice = payload[ParamKey.basePrice].int,
            let size = payload[ParamKey.size].string
            else { return nil }
        self.itemId = itemId
        self.name = name
        self.photoUrl = photoUrl
        self.description = description
        self.category = category
        self.unitPrice = unitPrice
        self.size = size
        self.sizeAddOnPrice = 0
        self.toppings = nil
        self.toppingsAddOnPrice = 0
        self.totalPrice = (unitPrice + sizeAddOnPrice + toppingsAddOnPrice) * quantity
        self.totalModifiersPrice = (sizeAddOnPrice + toppingsAddOnPrice) * 2
        self.quantity = 1
        self.modifiers = payload[ParamKey.modifiers].arrayObject as? [Modifier]
    }
}

</code>
  </pre>
  <P>
    你也可以使用
  </p>
   <pre>
    <code>
      try content.rawData() // for payload: JSON) {

</code>
  </pre>
  <P>
    至
     <code>
      JSON
    </code>
     数据，然后提供给
     <code>
      Decodable
    </code>
     类
  </p>
</DIV>