gistfile1.txt

import Foundation
import ContactsUI

struct User {
    
    var userContact  = CNContact()
    var recipientContact: CNContact?
    var isDefault: Bool = false
    init(userContact: CNContact, recipientContact: CNContact? = nil, isDefault: Bool) {
        self.userContact = userContact
        self.recipientContact = recipientContact
        self.isDefault = isDefault
    }
    
}

extension User {
    @objc(_TtCV6testUD4User6Coding)class Coding: NSObject, NSCoding {
        
        let model: User?
        
        init(model: User) {
            self.model = model
            super.init()
        }
        
        func encode(with aCoder: NSCoder) {
            guard let model = self.model else {
                return
            }
            
            aCoder.encode(model.userContact, forKey: "userContact")
            aCoder.encode(model.recipientContact, forKey: "recipientContact")
            aCoder.encode(model.isDefault, forKey: "isDefault")

        }
        
        required init?(coder aDecoder: NSCoder) {
            guard let userContact = aDecoder.decodeObject(forKey: "userContact") as? CNContact,let isDefault = aDecoder.decodeObject(forKey: "isDefault") as? Bool  else  {
                    return nil
            }
          let recipientContact = aDecoder.decodeObject(forKey: "recipientContact") as? CNContact
            
            model = User(userContact: userContact, recipientContact: recipientContact, isDefault: isDefault)
            super.init()
        }
        
    }
}

extension User: Encodable {
    var encoded: Decodable? {
        return User.Coding(model: self)
    }
}

extension User.Coding: Decodable {
    var decoded: Encodable? {
        return self.model
    }
}

extension Sequence where Iterator.Element: Encodable {
    var encoded: [Decodable] {
        return self.filter({ $0.encoded != nil }).map({ $0.encoded! })
    }
}
extension Sequence where Iterator.Element: Decodable {
    var decoded: [Encodable] {
        return self.filter({ $0.decoded != nil }).map({ $0.decoded! })
    }
}