Can Swift convert a class / struct data into dictionary?

Question

For example:

class Test {     var name: String;     var age: Int;     var height: Double;     func convertToDict() -> [String: AnyObject] { ..... } }  let test = Test(); test.name = "Alex"; test.age = 30; test.height = 170;  let dict = test.convertToDict(); 

dict will have content:

{"name": "Alex", "age": 30, height: 170} 

Is this possible in Swift?

And can I access a class like a dictionary, for example probably using:

test.value(forKey: "name"); 

Or something like that?

Thanks.

Answer 1

You can just add a computed property to your struct to return a Dictionary with your values. Note that Swift native dictionary type doesn't have any method called value(forKey:). You would need to cast your Dictionary to NSDictionary:

struct Test {     let name: String     let age: Int     let height: Double     var dictionary: [String: Any] {         return ["name": name,                 "age": age,                 "height": height]     }     var nsDictionary: NSDictionary {         return dictionary as NSDictionary     } } 

---

You can also extend Encodable protocol as suggested at the linked answer posted by @ColGraff to make it universal to all Encodable structs:

struct JSON {     static let encoder = JSONEncoder() } extension Encodable {     subscript(key: String) -> Any? {         return dictionary[key]     }     var dictionary: [String: Any] {         return (try? JSONSerialization.jsonObject(with: JSON.encoder.encode(self))) as? [String: Any] ?? [:]     } } 

---

struct Test: Codable {     let name: String     let age: Int     let height: Double }  let test = Test(name: "Alex", age: 30, height: 170) test["name"]    // Alex test["age"]     // 30 test["height"]  // 170