Saving custom objects in NSUserDefaults - Swift

FYISession.swift

import Foundation


class FYISession {
    let savedUserKey = "savedUser"
    static let sharedInstance = FYISession()
    var user:FYIUser = FYIUser(userId: 0, userMobile: "", userEmail: "", userName: "")
    
    
    func userLoggedIn() -> Bool{
        return (user.uname.characters.count > 0) || self.loggedInUsingFB()
    
    }
    
    func rememberUser(newUser:FYIUser){
        user = newUser
        let archivedObject = NSKeyedArchiver.archivedDataWithRootObject(newUser)
        let defaults = NSUserDefaults.standardUserDefaults()
        defaults.setObject(archivedObject, forKey: savedUserKey)
        defaults.synchronize()
    }
    
    func loadRememberedUser(){
        if let decodedNSDataBlob = NSUserDefaults.standardUserDefaults().objectForKey(savedUserKey) as? NSData {
            if let savedUser = NSKeyedUnarchiver.unarchiveObjectWithData(decodedNSDataBlob) as? FYIUser {
                user = savedUser
            }
        }

    }
}

FYIUser.swift

import Foundation

class FYIUser:NSObject,NSCoding {
    var id:NSInteger = 0
    var mobile:String = ""
    var email:String = ""
    var uname:String = ""
    

    required init(userId:NSInteger, userMobile:String, userEmail:String, userName:String) {
        id = userId
        mobile = userMobile
        email = userEmail
        uname = userName
        
        super.init()
    }
    
    //MARK: - NSCoding -
    required init(coder aDecoder: NSCoder) {
        id = aDecoder.decodeObjectForKey("id") as! NSInteger
        mobile = aDecoder.decodeObjectForKey("mobile") as! String
        email = aDecoder.decodeObjectForKey("email") as! String
        uname = aDecoder.decodeObjectForKey("uname") as! String
    }
    
    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encodeObject(id, forKey: "id")
        aCoder.encodeObject(mobile, forKey: "mobile")
        aCoder.encodeObject(email, forKey: "email")
        aCoder.encodeObject(uname, forKey: "uname")
    }
}