Attempt to insert non-property list object when trying to save a custom object in Swift 3

Question

I have a simple object which conforms to the NSCoding protocol.

import Foundation

class JobCategory: NSObject, NSCoding {
    var id: Int
    v         


        

Answer 1

Save dictionary Into userdefault

let data = NSKeyedArchiver.archivedData(withRootObject: DictionaryData)
UserDefaults.standard.set(data, forKey: kUserData)

Retrieving the dictionary

let outData = UserDefaults.standard.data(forKey: kUserData)
let dict = NSKeyedUnarchiver.unarchiveObject(with: outData!) as! NSDictionary

Answer 2

Update Swift 4, Xcode 10

I have written a struct around it for easy access.

//set, get & remove User own profile in cache
struct UserProfileCache {
    static let key = "userProfileCache"
    static func save(_ value: Profile!) {
         UserDefaults.standard.set(try? PropertyListEncoder().encode(value), forKey: key)
    }
    static func get() -> Profile! {
        var userData: Profile!
        if let data = UserDefaults.standard.value(forKey: key) as? Data {
            userData = try? PropertyListDecoder().decode(Profile.self, from: data)
            return userData!
        } else {
            return userData
        }
    }
    static func remove() {
        UserDefaults.standard.removeObject(forKey: key)
    }
}

Profile is a Json encoded object.

struct Profile: Codable {
let id: Int!
let firstName: String
let dob: String!
}

Usage:

//save details in user defaults...
UserProfileCache.save(profileDetails)

Hope that helps!!!

Thanks

Answer 3

Based on Harjot Singh answer. I've used like this:

struct AppData {

    static var myObject: MyObject? {

        get {
            if UserDefaults.standard.object(forKey: "UserLocationKey") != nil {
                if let data = UserDefaults.standard.value(forKey: "UserLocationKey") as? Data {
                    let myObject = try? PropertyListDecoder().decode(MyObject.self, from: data)
                    return myObject!
                }
            }
            return nil
        }

        set {
            UserDefaults.standard.set(try? PropertyListEncoder().encode(newValue), forKey: "UserLocationKey")
        }

    }
}

Answer 4

You need to create Data instance from your JobCategory instance using NSKeyedArchiver.archivedData(withRootObject:) and store that Data instance in UserDefaults and later unarchive using NSKeyedUnarchiver.unarchiveObject(with:), So try like this.

For Storing data in UserDefaults

let category = JobCategory(id: 1, name: "Test Category", URLString: "http://www.example-job.com")
let encodedData = NSKeyedArchiver.archivedData(withRootObject: category, requiringSecureCoding: false)
let userDefaults = UserDefaults.standard
userDefaults.set(encodedData, forKey: UserDefaultsKeys.jobCategory.rawValue)

For retrieving data from UserDefaults

let decoded  = UserDefaults.standard.object(forKey: UserDefaultsKeys.jobCategory.rawValue) as! Data
let decodedTeams = NSKeyedUnarchiver.unarchiveObject(with: decoded) as! JobCategory
print(decodedTeams.name)

Answer 5

Swift save Codable object to UserDefault with @propertyWrapper

@propertyWrapper
    struct UserDefault<T: Codable> {
        let key: String
        let defaultValue: T

        init(_ key: String, defaultValue: T) {
            self.key = key
            self.defaultValue = defaultValue
        }

        var wrappedValue: T {
            get {

                if let data = UserDefaults.standard.object(forKey: key) as? Data,
                    let user = try? JSONDecoder().decode(T.self, from: data) {
                    return user

                }

                return  defaultValue
            }
            set {
                if let encoded = try? JSONEncoder().encode(newValue) {
                    UserDefaults.standard.set(encoded, forKey: key)
                }
            }
        }
    }




enum GlobalSettings {

    @UserDefault("user", defaultValue: User(name:"",pass:"")) static var user: User
}

Example User model confirm Codable

struct User:Codable {
    let name:String
    let pass:String
}

How to use it

//Set value 
 GlobalSettings.user = User(name: "Ahmed", pass: "Ahmed")

//GetValue
print(GlobalSettings.user)