iOS 15+/swift6.0
- struct 또는 class에 추가되는 attached macro
- Codable conformance를 자동으로 추가한다.
@Codable
struct Person {
var name: String?
let age: Int
}- nested 구조를 한번에 처리한다.
- 아래처럼 사용할 수 있다.
@Codable
struct Person {
let name: String
@NestedIn("privacy")
var address: String
@NestedIn("privacy")
let gender: String
}
// 위 타입은 아래 json을 파싱한다.
{
"name": "민수",
"privacy": {
"address": "서울시",
"gender": "남성"
}
}추가되는 코드 (매크로를 우측 클릭한 후 expanded Macro를 선택해 확인 가능)
struct Person {
let name: String
let address: String?
let gender: String
init(name: String, address: String?, gender: String) {
self.name = name
self.address = address
self.gender = gender
}
enum CodingKeys: String, CodingKey {
case name
case address
case privacy
case gender
}
init(from decoder: Decoder) throws {
let container = try decoder.container(keyedBy: CodingKeys.self)
self.name = try container.decode(String.self, forKey: .name)
let privacy_container = try? container.nestedContainer(keyedBy: CodingKeys.self, forKey: .privacy)
self.address = try privacy_container?.decodeIfPresent(String.self, forKey: .address)
if let privacy_container {
self.gender = try privacy_container.decode(String.self, forKey: .gender)
} else {
let context = DecodingError.Context(codingPath: [CodingKeys.privacy], debugDescription: "key not found")
throw DecodingError.keyNotFound(CodingKeys.gender, context)
}
}
func encode(to encoder: Encoder) throws {
var container = encoder.container(keyedBy: CodingKeys.self)
try container.encode(self.name, forKey: .name)
var privacy_container = container.nestedContainer(keyedBy: CodingKeys.self, forKey: .privacy)
try privacy_container.encodeIfPresent(address, forKey: .address)
try privacy_container.encode(gender, forKey: .gender)
}
}
extension Person: Codable {
}@Codable이 타입에 추가되어야 한다.var이면서String?인 변수로 정의돼야 한다.