Swift：在結構中具有可編碼一致性的自定義鍵值編碼

Question

struct Struct: Encodable {
  let key: String
  let value: String
}

let aStruct = Struct(key: "abc", value: "xyz")

鑒於此結構和提供的默認Encodable一致性，JSON 編碼產生

{
    key = abc;
    value = xyz;
}

而相反，我想將其編碼為

{
    abc = xyz;
}

我如何使這個結構符合Encodable以得到這個結果？

Answer 1

實現encode(to encoder: Encoder)並將結構編碼為單個字典

struct Struct: Encodable {
    let key: String
    let value: String
    
    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        try container.encode([key:value])
    }
}