Creating a Custom class in Swift - For converting to NSData

Class - For Converting to NSData

import UIKit

//MARK: MultiPeer_CustomClass
class MultiPeer_CustomClass : NSObject
{
    //MARK: Local Variables
    var name : String?
    var age : Int?
    var email : String?
    
    // Decode
    required convenience init(coder decoder: NSCoder)
    {
        self.init()
        
        if let proper_name = decoder.decodeObjectForKey("name") as? String
        {
            self.name = proper_name
        }
        
        if let proper_age = decoder.decodeObjectForKey("age") as? Int
        {
            self.age = proper_age
        }
        
        if let proper_email = decoder.decodeObjectForKey("email") as? String
        {
            self.email = proper_email
        }
    }
    
    // Init
    convenience init(name : String, age : Int, email : String)
    {
        self.init()
        
        self.name = name
        self.age = age
        self.email = email
    }
    
    // Encode
    func encodeWithCoder(coder : NSCoder)
    {
        if let proper_name = self.name
        {
            coder.encodeObject(proper_name, forKey: "name")
        }
        
        if let proper_age = self.age
        {
            coder.encodeObject(proper_age, forKey: "age")
        }
        
        if let proper_email = self.email
        {
            coder.encodeObject(proper_email, forKey: "email")
        }
    }
}