How to save model class in UserDefaults with static self instance?

Question

I have a model class User that I want to save in UserDefaults

import UIKit

class User: NSObject {

    var name:String!
    var email:String!
    var userId:String!
    var phone:String!
    var admin_status:String!
    var social_code:String!
    var token:String!
    var otp:String!
    var forget_otp:String!
    var p_img:String!
    var created:String!
    var status:String!

    static var currentUser:User = User()

    override init() {
        super.init()
    }

    required init(coder aDecoder: NSCoder) {
        self.name = aDecoder.decodeObject(forKey: "name") as! String
        self.email = aDecoder.decodeObject(forKey: "email") as! String
        self.userId = aDecoder.decodeObject(forKey: "userId") as! String
        self.phone = aDecoder.decodeObject(forKey: "phone") as! String
        self.admin_status = aDecoder.decodeObject(forKey: "admin_status") as! String
        self.social_code = aDecoder.decodeObject(forKey: "social_code") as! String
        self.token = aDecoder.decodeObject(forKey: "token") as! String
        self.otp = aDecoder.decodeObject(forKey: "otp") as! String
        self.forget_otp = aDecoder.decodeObject(forKey: "forget_otp") as! String
        self.p_img = aDecoder.decodeObject(forKey: "p_img") as! String
        self.created = aDecoder.decodeObject(forKey: "created") as! String
        self.status = aDecoder.decodeObject(forKey: "status") as! String
    }

    func encodeWithCoder(aCoder: NSCoder) {
        aCoder.encode(name, forKey: "name")
        aCoder.encode(email, forKey: "email")
        aCoder.encode(userId, forKey: "userId")
        aCoder.encode(phone, forKey: "phone")
        aCoder.encode(admin_status, forKey: "admin_status")
        aCoder.encode(social_code, forKey: "social_code")
        aCoder.encode(token, forKey: "token")
        aCoder.encode(otp, forKey: "otp")
        aCoder.encode(forget_otp, forKey: "forget_otp")
        aCoder.encode(p_img, forKey: "p_img")
        aCoder.encode(created, forKey: "created")
        aCoder.encode(status, forKey: "status")
    }

}

Code to save and get from UserDefaults

class func setUserDefault(ObjectToSave : AnyObject?  , KeyToSave : String)
    {
        let defaults = UserDefaults.standard

        if (ObjectToSave != nil)
        {

            defaults.set(ObjectToSave, forKey: KeyToSave)
        }

        UserDefaults.standard.synchronize()
    }

    class func getUserDefault(KeyToReturnValye : String) -> AnyObject?
    {
        let defaults = UserDefaults.standard

        if let name = defaults.value(forKey: KeyToReturnValye)
        {
            return name as AnyObject
        }
        return nil
    }

Saving

let user:User = User()
                    user.name = json["data"]["first_name"].string
                    user.email = json["data"]["email"].string
                    user.phone = json["data"]["phone"].string
                    user.social_code = json["data"]["social_code"].string
                    user.admin_status = json["data"]["admin_status"].string
                    user.otp = json["data"]["otp"].string
                    user.forget_otp = json["data"]["forget_otp"].string
                    user.p_img = json["data"]["p_img"].string
                    user.status = json["data"]["status"].string
                    user.userId = json["data"]["id"].string
                    user.created = json["data"]["created"].string

                    Utilities.setUserDefault(ObjectToSave: user, KeyToSave: "user")

I also tried this

let encodedData = NSKeyedArchiver.archivedData(withRootObject: user)
                    UserDefaults.standard.set(encodedData, forKey: "User")

but it crashes because of static var currentUser:User = User()

how to fix this ?

I write the code that I am using but I don't know what to do with static var currentUser:User = User() — Varun Naharia

Anton Belousov Anton Belousov · Accepted Answer · 2017-05-30T06:02:55

As for NSCoding: you have wrong method signature. Change

func encodeWithCoder(aCoder: NSCoder)

to

func encode(with aCoder: NSCoder)

Also, your object should explicitly conform to the NSCoding protocol:

class User: NSObject, NSCoding {...}

As for UserDefaults, you can not store custom objects in the UserDefaults, only NSData, NSString, NSNumber, NSDate, NSArray, or NSDictionary (or similar types in Swift), see documentation

How to save model class in UserDefaults with static self instance?

2 Answers