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项目作者： ClintJang

项目描述 ：
Swift Codable Sample, 간단한 설명과 셈플입니다.
高级语言： Swift
项目地址: git://github.com/ClintJang/sample-swift-codable.git
创建时间： 2018-11-13T08:54:00Z
项目社区：https://github.com/ClintJang/sample-swift-codable
开源协议：MIT License
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Sample Swift Codable

Swift Codable Sample 입니다.

Codable

  1. Type Alias
  3. Codable
  4. A type that can convert itself into and out of an external representation.
  6. Declaration
  7. typealias Codable = Decodable & Encodable
  9. Discussion
  10. Codable is a type alias for the Encodable and Decodable protocols. When you use Codable as a type or a generic constraint, it matches any type that conforms to both protocols.

이라 설명이 되어있습니다.

  1. Codable 은 Type Alias 입니다.
  3. Codable
  4. 외부 표현으로 변환하거나 외부 표현으로 변환할 수 있는 유형입니다.
  6. 선언
  7. typealias Codable = Decodable & Encodable
  9. Discussion
  10. Codable은 Encodable 및 Decodable 프로토콜의 typealias입니다.
  11. Codable을 사용하면 두 프로토콜을 모두 준수해야 되지요.

통상 사용할 때는 디코딩을 할때 사용하는 것 같습니다.

설명이 잘 되어있는 링크

Sample Source

이해를 돕기위해 셈플 소스를 추가해 봤습니다.

  1. struct SampleStructData01: Codable {
  2.     let id: String
  3.     let code: String
  4.     var order: Int?
  5.     var test: Int?
  6. }
  8. struct SampleStructData02: Codable {
  9.     let code: String
  10.     let data: SampleStructData02SubData
  12.     struct SampleStructData02SubData: Codable {
  13.         let id : String
  14.         let code : String
  15.         let order : Int
  16.     }
  17. }
  19. struct SampleStructData03 : Codable {
  20.     let id : String
  21.     var code : String?
  22.     var order : Int
  23.     enum CodingKeys : String, CodingKey{
  24.         case id
  25.         case code
  26.         case order = "order_test"
  27.     }
  28. }
  30. struct SampleStructData04 : Codable {
  31.     let id : String
  32.     let code : String
  33.     let order : Int
  34. }
  36. /// https://github.com/yonaskolb/Codability
  37. struct SampleAnyCodableData01 : Codable {
  38.     let id : AnyCodable
  39.     let code : String
  40. }
  1. struct SampleResponse { }
  3. /**
  4.  {
  5.      userId: 1,
  6.      id: 1,
  7.      title: "delectus aut autem",
  8.      completed: false
  9.  }
  10.  */
  11. extension SampleResponse {
  12.     struct todos: Codable {
  13.         let userId:Int
  14.         let id:Int
  15.         let title: String?
  16.         let completed:Bool?
  18.         let testTrash:String?
  19.     }
  20. }

  • ViewController.swift

    • func sampleStructData01()

      1. func sampleStructData01() {
      2.   print("===============================")
      3.   print("== \(#function)")
      5.   let dataJsonString = """
      6.   {
      7.       "id": "test@gmail.com",
      8.       "code": "abcdefg1234",
      9.       "order": 1
      10.   }
      11.   """.data(using: .utf8)!
      13.   let sample = try! JSONDecoder().decode(SampleStructData01.self, from: dataJsonString)
      14.   print(sample)
      15.   print("===============================\n\n")
      16. }

    • func sampleStructData02()

      1. func sampleStructData02() {
      2.   print("===============================")
      3.   print("== \(#function)")
      5.   let dataJsonString = """
      6.   {
      7.       "code": "poiuytrewq",
      8.       "data": {
      9.           "id": "test@gmail.com",
      10.           "code": "abcdefg1234",
      11.           "order": 1
      12.       }
      13.   }
      14.   """.data(using: .utf8)!
      16.   let sample = try! JSONDecoder().decode(SampleStructData02.self, from: dataJsonString)
      17.   print(sample)
      18.   print("===============================\n\n")
      19. }

    • func sampleStructData03()

      1. func sampleStructData02() {
      2.   print("===============================")
      3.   print("== \(#function)")
      5.   let dataJsonString = """
      6.   {
      7.       "id": "test@gmail.com",
      8.       "code": "abcdefg1234",
      9.       "order_test": 1
      10.   }
      11.   """.data(using: .utf8)!
      13.   let sample = try! JSONDecoder().decode(SampleStructData03.self, from: dataJsonString)
      14.   print(sample)
      15.   print("===============================\n\n")
      16. }
      • func sampleStructData04()
      1. func sampleStructData02() {
      2.   print("===============================")
      3.   print("== \(#function)")
      5.   let dataJsonString = """
      6.   [
      7.       {
      8.           "id": "aaaa@gmail.com",
      9.           "code": "1234567890",
      10.           "order": 1
      11.       },
      12.       {
      13.           "id": "bbbb@gmail.com",
      14.           "code": "abcdefghijklmn",
      15.           "order": 2
      16.       }
      17.   ]
      18.   """.data(using: .utf8)!
      20.   do {
      21.       let sample = try JSONDecoder().decode([SampleStructData04].self, from: dataJsonString)
      22.       print(sample)
      23.   } catch {
      24.       print(error)
      25.   }
      27.   print("===============================\n\n")
      28. }

    • func sampleAnyCodableData01()

      • Codable을 사용하면서 Any 타입이 필요할 때.. 쉽지 않습니다. 그래서 라이브러리를 하나 사용해 봤습니다.

      • https://github.com/yonaskolb/Codability

        1. func sampleAnyCodableData01() {
        2. print("===============================")
        3. print("== \(#function)")
        5. let dataJsonString = """
        6. [
        7.   {
        8.       "id": "aaaa@gmail.com",
        9.       "code": "1234567890",
        10.   },
        11.   {
        12.       "id": 1234,
        13.       "code": "abcdefghijklmn",
        14.   }
        15. ]
        16. """.data(using: .utf8)!
        18. do {
        19.   let samples = try JSONDecoder().decode([SampleAnyCodableData01].self, from: dataJsonString)
        20.   //
        21.   _ = samples.enumerated().map { sample -> String in
        22.       if sample.element.id.value is String {
        23.           print("index \(sample.offset) : id.value is String")
        24.       } else if sample.element.id.value is Int {
        25.           print("index \(sample.offset) : id.value is Int")
        26.       } else {
        27.           print("index \(sample.offset) : id.value is ?")
        28.       }
        29.       return ""
        30.   }
        31.   print(samples)
        32. } catch {
        33.   print(error)
        34. }
        36. print("===============================\n\n")
        37. }

    • func sampleRequest01()

      1. func sampleRequest01(){
      2.   print("===============================")
      3.   print("== \(#function)")
      5.   let url = URL(string: "https://jsonplaceholder.typicode.com/todos/1")
      6.   URLSession.shared.dataTask(with: url!, completionHandler: {
      7.       (data, response, error) in
      8.       if let error = error {
      9.           print("== \(error)")
      10.       } else {
      11.           print("== success")
      13.           guard let data = data else {
      14.               return
      15.           }
      17.           do {
      18.               let codableStruct = try JSONDecoder().decode(SampleResponse.todos.self, from: data)
      19.               print("\(codableStruct)")
      20.               print("== id : \(codableStruct.id)")
      21.           } catch {
      22.               print("== err in codable")
      23.           }
      25.           print("===============================\n\n")
      26.       }
      27.   }).resume()
      28. }

Result Log

  1. ===============================
  2. == sampleStructData01()
  3. SampleStructData01(id: "test@gmail.com", code: "abcdefg1234", order: Optional(1), test: nil)
  4. ===============================
  7. ===============================
  8. == sampleStructData02()
  9. SampleStructData02(code: "poiuytrewq", data: JWSCodableSample.SampleStructData02.SampleStructData02SubData(id: "test@gmail.com", code: "abcdefg1234", order: 1))
  10. ===============================
  13. ===============================
  14. == sampleStructData03()
  15. SampleStructData03(id: "test@gmail.com", code: Optional("abcdefg1234"), order: 1)
  16. ===============================
  19. ===============================
  20. == sampleStructData04()
  21. [JWSCodableSample.SampleStructData04(id: "aaaa@gmail.com", code: "1234567890", order: 1), JWSCodableSample.SampleStructData04(id: "bbbb@gmail.com", code: "abcdefghijklmn", order: 2)]
  22. ===============================
  25. ===============================
  26. == sampleRequest01()
  27. == success
  28. todos(userId: 1, id: 1, title: Optional("delectus aut autem"), completed: Optional(false), testTrash: nil)
  29. == id : 1
  30. ===============================