Swift 5 - JSON具有嵌套 JSON 的编码器

Question

我正在尝试将 [[String : String]] 编码为具有 JSONEncoder() 的 JSON 嵌套对象。

Swift 输出示例：

[["firstName": "John", "lastName": "Doe"], ["firstName": "Tim", "lastName": "Cook"]]

编码后 JSON 的预期输出：

[
  {
    "firstName": "John",
    "lastName": "Doe"
  },

  {
    "firstName": "Tim",
    "lastName": "Cook"
  }
]

我将如何遍历这个字典数组然后用 JSONEncoder().encode() 对其进行编码？非常感谢！

Answer 1

JSONEncoder 默认给你 Data。要将其恢复为 String 形式，您可以使用：

let input = [["firstName": "John", "lastName": "Doe"], ["firstName": "Tim", "lastName": "Cook"]]

do {
    let json = try JSONEncoder().encode(input)
    print(String(decoding: json, as: UTF8.self))
} catch {
    print(error)
}

产生：

[{"firstName":"John","lastName":"Doe"},{"firstName":"Tim","lastName":"Cook"}]

Answer 2

使用Codable到encode/decodeJSON数据。首先，将JSON转换成这样的对象，如果你更新更多字段会更容易：

struct Person: Codable {
    var firstName: String
    var lastName: String
}

假设你有一个Person数组

var persons = [Person]()
persons.append(.init(firstName: "John", lastName: "Doe"))
persons.append(.init(firstName: "Tim", lastName: "Cook"))

//PRINT OUT
let jsonData = try! JSONEncoder().encode(persons)
let jsonString = String(data: jsonData, encoding: .utf8)

这是输出：

"[{"firstName":"John","lastName":"Doe"},{"firstName":"Tim","lastName":"Cook"}]"

Swift 5 - JSON具有嵌套 JSON 的编码器

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