Ios 将数组编码为json时密钥顺序问题

您好，我正在将

数组编码为
json
，这样我就创建了如下的模型类

class QuotationListDataModel: Codable{
    var quatation_id: String?
    var PartNumber: String?
    var Description: String?
    var Quantity: String?
    var AvailableStockQty: String?
    var Each: String?
    init(quatation_id: String?, PartNumber: String?,Description: String?,Quantity:String?,AvailableStockQty: String?,Each: String?) {
        self.quatation_id = quatation_id
        self.PartNumber = PartNumber
        self.Description = Description
        self.Quantity = Quantity
        self.AvailableStockQty = AvailableStockQty
        self.Each = Each
    }

}

  let encoder = JSONEncoder()
  encoder.outputFormatting = .prettyPrinted
  do {
       let jsonData = try encoder.encode(quotationSeelctedData)
       if let jsonString = String.init(data: jsonData, encoding: .utf8) {
             print(jsonString)
       }
  } catch {
      print("the encoding failed")
  }

[
  {
    "quatation_id": "67",
    "Description": "PSH BTN",
    "Each": "140.00 Total 40320.00",
    "PartNumber": "15",
    "Quantity": "288",
    "AvailableStockQty": "0"
  },
  {
    "quatation_id": "66",
    "Description": "SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)",
    "Each": "14.00 Total 3612.00",
    "PartNumber": "000015-40",
    "Quantity": "258",
    "AvailableStockQty": "10"
  }
]

Part Number : 000015-40

Description : SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)

Quantity : 10

Available Stock Qty. : 10

Each: 12.1 Total: 121

我正在编码的代码如下所示

class QuotationListDataModel: Codable{
    var quatation_id: String?
    var PartNumber: String?
    var Description: String?
    var Quantity: String?
    var AvailableStockQty: String?
    var Each: String?
    init(quatation_id: String?, PartNumber: String?,Description: String?,Quantity:String?,AvailableStockQty: String?,Each: String?) {
        self.quatation_id = quatation_id
        self.PartNumber = PartNumber
        self.Description = Description
        self.Quantity = Quantity
        self.AvailableStockQty = AvailableStockQty
        self.Each = Each
    }

}

  let encoder = JSONEncoder()
  encoder.outputFormatting = .prettyPrinted
  do {
       let jsonData = try encoder.encode(quotationSeelctedData)
       if let jsonString = String.init(data: jsonData, encoding: .utf8) {
             print(jsonString)
       }
  } catch {
      print("the encoding failed")
  }

[
  {
    "quatation_id": "67",
    "Description": "PSH BTN",
    "Each": "140.00 Total 40320.00",
    "PartNumber": "15",
    "Quantity": "288",
    "AvailableStockQty": "0"
  },
  {
    "quatation_id": "66",
    "Description": "SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)",
    "Each": "14.00 Total 3612.00",
    "PartNumber": "000015-40",
    "Quantity": "258",
    "AvailableStockQty": "10"
  }
]

Part Number : 000015-40

Description : SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)

Quantity : 10

Available Stock Qty. : 10

Each: 12.1 Total: 121

这段代码成功地进行了json编码，但当我打印编码的字符串时，顺序没有得到维护，然后我得到如下输出

class QuotationListDataModel: Codable{
    var quatation_id: String?
    var PartNumber: String?
    var Description: String?
    var Quantity: String?
    var AvailableStockQty: String?
    var Each: String?
    init(quatation_id: String?, PartNumber: String?,Description: String?,Quantity:String?,AvailableStockQty: String?,Each: String?) {
        self.quatation_id = quatation_id
        self.PartNumber = PartNumber
        self.Description = Description
        self.Quantity = Quantity
        self.AvailableStockQty = AvailableStockQty
        self.Each = Each
    }

}

  let encoder = JSONEncoder()
  encoder.outputFormatting = .prettyPrinted
  do {
       let jsonData = try encoder.encode(quotationSeelctedData)
       if let jsonString = String.init(data: jsonData, encoding: .utf8) {
             print(jsonString)
       }
  } catch {
      print("the encoding failed")
  }

[
  {
    "quatation_id": "67",
    "Description": "PSH BTN",
    "Each": "140.00 Total 40320.00",
    "PartNumber": "15",
    "Quantity": "288",
    "AvailableStockQty": "0"
  },
  {
    "quatation_id": "66",
    "Description": "SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)",
    "Each": "14.00 Total 3612.00",
    "PartNumber": "000015-40",
    "Quantity": "258",
    "AvailableStockQty": "10"
  }
]

Part Number : 000015-40

Description : SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)

Quantity : 10

Available Stock Qty. : 10

Each: 12.1 Total: 121

我希望输出如下

class QuotationListDataModel: Codable{
    var quatation_id: String?
    var PartNumber: String?
    var Description: String?
    var Quantity: String?
    var AvailableStockQty: String?
    var Each: String?
    init(quatation_id: String?, PartNumber: String?,Description: String?,Quantity:String?,AvailableStockQty: String?,Each: String?) {
        self.quatation_id = quatation_id
        self.PartNumber = PartNumber
        self.Description = Description
        self.Quantity = Quantity
        self.AvailableStockQty = AvailableStockQty
        self.Each = Each
    }

}

  let encoder = JSONEncoder()
  encoder.outputFormatting = .prettyPrinted
  do {
       let jsonData = try encoder.encode(quotationSeelctedData)
       if let jsonString = String.init(data: jsonData, encoding: .utf8) {
             print(jsonString)
       }
  } catch {
      print("the encoding failed")
  }

[
  {
    "quatation_id": "67",
    "Description": "PSH BTN",
    "Each": "140.00 Total 40320.00",
    "PartNumber": "15",
    "Quantity": "288",
    "AvailableStockQty": "0"
  },
  {
    "quatation_id": "66",
    "Description": "SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)",
    "Each": "14.00 Total 3612.00",
    "PartNumber": "000015-40",
    "Quantity": "258",
    "AvailableStockQty": "10"
  }
]

Part Number : 000015-40

Description : SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)

Quantity : 10

Available Stock Qty. : 10

Each: 12.1 Total: 121

有谁能告诉我如何按照我的模型类保持顺序吗？我猜，根据上面的评论，你实际上不想订购字典的键，你希望打印版本的顺序如下：

Part Number : 000015-40
Description : SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)
Quantity : 10
Available Stock Qty. : 10
Each: 12.1 Total: 121

所以，我想正确的答案是打印如下：

Part Number : 000015-40
Description : SELF-CLOSING 4-ARM HANDLE (PLATED BRASS)
Quantity : 10
Available Stock Qty. : 10
Each: 12.1 Total: 121

首先，创建包装器

struct FailableDecodable:Decodable{
让基地：基地？
init（来自解码器：解码器）抛出{
let container=尝试解码器。singleValueContainer（）
self.base=try？container.decode（base.self）
}
}

let items=try JSONDecoder（）
.decode（[FailableDecodable].self，from:json）
.compactMap{$0.base}/.Swift 4.0中的.flatMap
}
}抓住{
打印（“编码失败”）
}
打印（项目）

如果你想按你的意愿打印它们

用于项目中的项目{
print（“Part Number:\（item.PartNumber！）”//试试这个，encoder.outputFormatting=.sortedKeys，看看发生了什么我已经试过了，但仍然顺序错误字典没有顺序。你不应该关心顺序，它是一个键访问，而不是索引访问。所以如果是因为“Part Number”不是“第一个”表面上看，这是正常的行为。那么还有其他解决方案吗？我能知道你为什么要订购吗？我想你能得到的唯一订单是alpha.订单。