Codeable is a type alias for the Encodable and Decodable protocols. It can be used to Serialize and Deserialize remote web service data or any data for that matter. Let’s see some code.

A simple example first. Below is the Datum struct.

struct Datum: Codable {
	    var name: String?
	    var detail: String?
	}

Let’s see the encoding and decoding example of Datum.

func encodeDatum() {
	    // encode datum
	    do {
	        let datum = Datum(name: "data0", detail: "This is data0")
	        let jsonData = try JSONEncoder().encode(datum)
	        print(String(data: jsonData, encoding: .utf8)!)
	    } catch {
	        print("error: \(error)")
	    }
	}

	func decodeDatum() {
	    let jsonString = """
	            {
	                "name": "data0",
	                "detail": "This is data0"
	            }
	            """
	    let jsonData = jsonString.data(using: .utf8)!
	    // decode datum
	    do {
	        let datum = try JSONDecoder().decode(Datum.self, from: jsonData)
	        print(datum)
	    } catch {
	        print("error: \(error)")
	    }
	}

#swift #ios