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

You need to create Data instance from your JobCategory instance using archivedData(withRootObject:) and store that Data instance in UserDefaults and later unarchive using unarchiveTopLevelObjectWithData(_:), 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.unarchiveTopLevelObjectWithData(decoded) as! JobCategory
print(decodedTeams.name)

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

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