How do I make an enum Decodable in swift 4?

Question

enum PostType: Decodable {      init(from decoder: Decoder) throws {          // What do i put here?     }      case Image     enum CodingKeys: String, CodingKey {         case image     } } 

What do i put to complete this? Also, lets say i changed the case to this:

case image(value: Int) 

How do i make this conform to Decodable ?

EDit Here is my full code (which does not work)

let jsonData = """ {     "count": 4 } """.data(using: .utf8)!          do {             let decoder = JSONDecoder()             let response = try decoder.decode(PostType.self, from: jsonData)              print(response)         } catch {             print(error)         }     } }  enum PostType: Int, Codable {     case count = 4 } 

Final Edit Also, how will it handle an enum like this?

enum PostType: Decodable {     case count(number: Int) } 

Answer 1

It's pretty easy, just use String or Int raw values which are implicitly assigned.

enum PostType: Int, Codable {     case image, blob } 

image is encoded to 0 and blob to 1

Or

enum PostType: String, Codable {     case image, blob } 

image is encoded to "image" and blob to "blob"

---

This is a simple example how to use it:

enum PostType : Int, Codable {     case count = 4 }  struct Post : Codable {     var type : PostType }  let jsonString = "{\"type\": 4}"  let jsonData = Data(jsonString.utf8)  do {     let decoded = try JSONDecoder().decode(Post.self, from: jsonData)     print("decoded:", decoded.type) } catch {     print(error) }