Map dictionary [String:Any] to class - json

Question

I was wondering if there is a way to map a dictionary to a class. If this is my class:
class Class{
var x = 0
var y = "hi"
}
And this is my dictionary (dict) with type [String: Any]
["x": 1, "y": "hello"]
Is there any easy way to convert the values of the dictionary to my class Class?
I now do it like this:
classInstance.x = dict["x"] as? Int ?? 0
I would like to know if it possible to search in the JSON for a key that matches the name of the variable of the class and if it matches, assign the value of the JSON's key to the value of the variable of the class. In my way (above) I need to type it line by line and maybe there is a one-liner to map the JSON into the class.

Answer 1

Built-in solution with JSONSerialization and Codable
let dictionary : [String:Any] = ["x": 1, "y": "hello"]
class Class : Codable {
let x : Int
let y : String
}
do {
let jsonData = try JSONSerialization.data(withJSONObject: dictionary)
let instance = try JSONDecoder().decode(Class.self, from: jsonData)
print(instance.x, instance.y)
} catch {
print(error)
}

Answer 2

This is how my function finally looks. It takes in any object that conforms to Decodable and return a subclass from the JSONData :)
import UIKit
class DecodeObject{
func decode<T: Decodable>(data: [String : Any], type: T.Type) -> T? {
do {
let jsonData = try JSONSerialization.data(withJSONObject: data)
return try JSONDecoder().decode(T.self, from: jsonData)
} catch {
return nil
}
}
}

Answer 3

extension Dictionary where Key == String, Value == Any {
func decode<T: Decodable>() throws -> T? {
do {
let data = try JSONSerialization.data(withJSONObject: self)
return try JSONDecoder().decode(T.self, from: data)
} catch {
throw error
}
}
}
struct Person: Decodable {
let name: String
let age: Int
}
let person: Person? = try? ["name": "fred", "age": 12].decode()