Save custom object to NSUserDefaults - ios

Question

I want to save my object into NSUserDefaults.
here is my Model:
class User: SafeJson {
var email: String?
var name: String?
}
SafeJson:
class SafeJson: NSObject {
override func setValue(_ value: Any?, forKey key: String) {
let uppercasedFirstCharacter = String(key.first!).uppercased()
let range = NSMakeRange(0, 1)
let selectorString = NSString(string: key).replacingCharacters(in: range, with: uppercasedFirstCharacter)
let selector = NSSelectorFromString("set\(selectorString):")
let responds = self.responds(to: selector)
if !responds {
print("\n\n\n*******--->\(selector) key is missing in API response...<---*******\n\n\n")
return
}
super.setValue(value, forKey: key)
}
}
Created UserObj by this:
let UserObj = User()
UserObj.setValuesForKeys(responseOfAPI)
now I want to save UserObj to NSUserDefaults but don't know how to do...
and I don't want to use required init(coder aDecoder: NSCoder) and func encode(with aCoder: NSCoder) in my model class because there are so many properties of User Model.
thanks!!

Answer 1

You cannot serialize objects to UserDefaults, generally.
However, since you're working with JSON, you can use the Codable type to translate the object to/from JSON for storage.
[*] One caveat is that Any isn't Codable. The simplest way to make a type codable is to declare its properties using types that are already Codable. These types include standard library types like String, Int, and Double; and Foundation types like Date, Data, and URL. Any type whose properties are codable automatically conforms to Codable just by declaring that conformance.
Here's a simplified example:
//: Playground - noun: a place where people can play
import UIKit
class SafeJson: Codable {
var strValues:[String:String] = [:]
var intValues:[String:Int] = [:]
func setValue(_ value: String?, forKey key: String) {
strValues[key] = value
}
func setValue(_ value: Int?, forKey key: String) {
intValues[key] = value
}
}
let encoder = JSONEncoder()
let decoder = JSONDecoder()
let sampleObject = SafeJson()
sampleObject.setValue(12, forKey: "intValue1")
sampleObject.setValue(12345, forKey: "intValue2")
sampleObject.setValue("Banana", forKey: "yellowFruit1")
sampleObject.setValue("Orange", forKey: "orangeFruit1")
let encoded = try encoder.encode(sampleObject)
let key = "encodedObj"
UserDefaults.standard.setValue(encoded, forKey: key)
if let readValue = UserDefaults.standard.value(forKey: key) as? Data {
let decodedObj = try decoder.decode(SafeJson.self, from: readValue)
print("Decoded to \(decodedObj)")
}