Saving an array of dictionary coming from plist , with UserDefaults

Question

I need to save my array with UserDefaults because I want users have ability to add or delete rows them selves. I have a plist contains rows of dictionaries. I fill an array name countries with the rows on plist like this

var imageList = ["usaflag","gerflag","franceflag","jpflag","gerflag"]
var countries = [Country]()
override func viewDidLoad() {
    super.viewDidLoad()

    let urlPlist = Bundle.main.url(forResource: "ListinFirstPage", withExtension: "plist")!
    let data = try! Data(contentsOf: urlPlist)
     do
    {
        countries = try PropertyListDecoder().decode([Country].self, from: data)
    }
    catch
    {
        // Handle error
        print(error)
    }

   savePlaces()


  }

Now the Array countries contains my plist rows. (filled with data of rows and works fine). my problem is how to save this array in UserDefaults, as it is an array of dictionaries seems it is a little complicated. I did this like the codes in bottom but it throws a thread in app delegate.

I added this line in viewdidload to call save function

savePlaces()

and then here is my savePlaces function

 func savePlaces(){

    do
    {
        let placesData = try NSKeyedArchiver.archivedData(withRootObject: countries, requiringSecureCoding: false)
    UserDefaults.standard.set(placesData, forKey: "places")
    print("Here is save function")
    }
    catch
    {
    print("SaveError")
    }


}

It seems that problem is because of countries array which it is an array of dictionaries coming from plist, because when I change this line

let placesData = try NSKeyedArchiver.archivedData(withRootObject: countries, requiringSecureCoding: false)

to this

let placesData = try NSKeyedArchiver.archivedData(withRootObject: imageList, requiringSecureCoding: false)

I mean I changed the countries to the imageList which is an array of strings, it works fine. I defined image list in first line

 var imageList = ["usaflag","gerflag","franceflag","jpflag","gerflag"]

so the problem is countries but I do not know why and I will really appreciate for any ideas

Answer 1

You cannot serialize struct s with NSKeyedArchiver .

In Country replace Decodable with Codable and use that to save the array

func savePlaces() 
{
    do {
        let placesData = try PropertyListEncoder().encode(countries)                 
        UserDefaults.standard.set(placesData, forKey: "places")
    } catch {
        print(error)
    }
}