How to make a struct with `variable: [String: Codable]` codable?

Question

I got a struct like the following

struct Wrapper {

  var value: [String: Any]
  // type "Any" could be String, Int or [String]. 
  // i.g. ["a": 1, "b": ["ccc"]]
  // and the keys of this dictionary are not determined 
}

I been struggled for quite a while😭. Anyone has any idea how to resolve it?

You can use enum types instead of Any but i think such missy json need a usual serialization not codable — Shehata Gamal
– Shehata Gamal, Commented Mar 30, 2021 at 11:46

nickinade · Accepted Answer · 2021-03-30 16:01:16Z

2

You can use some library like AnyCodable

Then you can make your struct Codable by using AnyCodable class instead of Any.

struct Wrapper: Codable {
    var value: [String: AnyCodable]
}

Example

let arrayWrapper: [String: Any] =
["value" :
       [
         "test" : ["1", "2", "3"],
         "parse" : ["4", "5", "6"]]
        ]

let jsonData = try! JSONSerialization.data(withJSONObject: arrayWrapper, options: .prettyPrinted)

do {
   let decoder = JSONDecoder()
   let result = try decoder.decode(Wrapper.self, from: jsonData)
   print("result:", result)
} catch let error {
   print("error:", error)
}

Output

result: Wrapper(value: ["parse": AnyCodable(["4", "5", "6"]), "test": AnyCodable(["1", "2", "3"])])

answered Mar 30, 2021 at 16:01

nickinade

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