如何使用swift解码协议解析嵌套的JSON数据？

Question

我有一个应用程序可以从服务器获取一些 JSON 数据，看起来像这样：

"operationsInfo": {
    "bill": {
        "activeProviders": [
              {
                "max": 50,
                "min": 10,
                "name": "name1"
              },
              {
                "max": 50,
                "min": 10,
                "name": "name2"
              }
         ]
    },
    "pin": {
        "activeProviders": [
              {
                "max": 50,
                "min": 10,
                "name": "name3"
              },
              {
                "max": 50,
                "min": 10,
                "name": name4
              }
        ]
    }
}

如何使用 swift 可解码协议反序列化此 JSON 数据？我的自定义对象如下所示：

struct operationList: Decodable {

    let name: String
    let action: String
    let min, max: Int
}

operationList 对象中的操作值必须等于 "bill" 或 "pin"。最后我想在解码JSON数据时得到一个operationList对象类型的数组，例如：

let operationListArray = [operationList1, operationList2, operationList3, operationList4] operationList1.action = "bill", operationList1.max = 50, operationList1.name = "name1" operationList2.action = "bill", operationList2.max = 50, operationList2.name = "name2" operationList3.action = "pin", operationList3.max = 50, operationList3.name = "name3" operationList4.action = "pin", operationList4.max = 50, operationList4.name = "name4"

我已经看到像这样的其他答案，例如：但我的问题是如何将 "bill" 或 "pin" 放入操作值中，将来可能会出现新的键值，如 "transfer"（如 "pin" 或 "bill") 添加到 JSON 数据。

Answer 1

正如@rmaddy 在评论中提到的，您想分两步完成此操作。

首先，创建一个与您的 JSON 格式匹配的结构并对其进行解码：

struct Response: Decodable {
    let operationsInfo: [String: Providers]
}

struct Providers: Decodable {
    let activeProviders: [Provider]
}

struct Provider: Decodable {
    let name: String
    let min: Int
    let max: Int
}

let response = try JSONDecoder().decode(Response.self, from: data)

然后，声明一个表示您希望数据采用的格式的结构并将其映射：

struct ProviderAction {
    let action: String
    let provider: Provider
}

let actions: [ProviderAction] = response.operationsInfo.map { action, providers in
    providers.activeProviders.map { ProviderAction(action: action, provider: [=11=]) }
}.flatMap { [=11=] }

如何使用swift解码协议解析嵌套的JSON数据？

how to use swift decodable protocol to parse nested JSON data?

json

ios

swift

decodable