Unarchiving a dictionary with unarchiveObjectWithFile using swift - swift

Question

I am facing problem with the data that I got from using unarchiveObjectWithFile. I send a dictionary for archiving. The data, I got shows the value while debugging but I can't extract the exact value for key from the data. Always getting nil value
Here is my code
class Person : NSObject, NSCoding {
struct Keys {
static let Name = "name"
static let Age = "age"
}
var name: [String] = []
var age: [Int] = []
init(dictionary: [String : AnyObject]) {
name = dictionary[Keys.Name] as! [String]
age = dictionary[Keys.Age] as! [Int]
}
func encodeWithCoder(archiver: NSCoder) {
archiver.encodeObject(name, forKey: Keys.Name)
archiver.encodeObject(age, forKey: Keys.Age)
}
required init(coder unarchiver: NSCoder) {
if let namesList = unarchiver.decodeObjectForKey(Keys.Name) as? [String] {
name = namesList
print("name\(name)")
}
if let agesList = unarchiver.decodeObjectForKey(Keys.Age) as? [Int] {
age = agesList
print("age \(age)")
}
super.init()
}
}
// View controller
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let persons: [String:AnyObject] = [
"name" : ["a","b","c"],
"age" : [2,3,4]
]
let personObj = Person(dictionary: persons)
NSKeyedArchiver.archiveRootObject(personObj, toFile: "/Users/shuvo/Desktop/Data.json")
let responseObject = NSKeyedUnarchiver.unarchiveObjectWithFile("/Users/shuvo/Desktop/Data.json") as? Person
if let unwrapData: AnyObject = responseObject {
let nameArr = unwrapData["name"] as? [String]
let ageArr = unwrapData["age"] as? [Int]
print("age \(ageArr) name \(nameArr)")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

That's because you are archiving the Person object and not the [String: AnyObject].
You can either archive the Person, and extract it as a Person or archive the [String: AnyObject] and extract that. You can't use both as they are different types.
If you want to archive the Person object, make sure you implement the NSCoding protocol and have something similar to this in your Person class...
func encode(with aCoder: NSCoder) {
aCoder.encode(name, forKey: "name")
aCoder.encode(age, forKey: "age")
}
required init?(coder aDecoder: NSCoder) {
self.name = aDecoder.decodeObject(forKey: "name") as! [String]
self.age = aDecoder.decodeObject(forKey: "age") as! [Int]
}
After that, you can just do...
if let responseObject = NSKeyedUnarchiver.unarchiveObject(withFile: path) as? Person {
// You can use `responseObject` as a `Person` object here...
}