Swift NSCoding enum of Hashable

Question

I would like to know how can I encode an enum made of Hashables? I know how to encode it using Codable, but in my case it has to be done by using NSCoding. My enums are as following:

enum ItemCatalog: Hashable {
    case sword(Swords) 
    case shield(Shields)  
    case armor(Armors)  
}

enum Swords: String{  
    case sabre
    case xiphos
    case broadsword
}

enum Shields: String {
    case buckler
    case heaterShield
}

enum Armors: String {
    case studArmor 
    case chainmail 
    case plateArmor
}

I tried to encode it by:

override func encode(with aCoder: NSCoder) {
    aCoder.encode(catalogCode, forKey: "catalogCode")
}

and the app crashed with an error, therefore, I tried:

aCoder.encode(catalogCode.hashValue, forKey: "catalogCode")

the app will run without crashing but I'm not sure if it was the right way to encode it. Anyhow, when it comes to decoding it, I have no idea how to do it. I tried the following and the app crashed because it returned a nil:

required convenience init?(coder aDecoder: NSCoder) {
        let catalogCode = aDecoder.decodeObject(forKey: "catalogCode") as? ItemCatalog
        self.init(itemCatalogCode: catalogCode!)
}

Could someone please show me how to do it?

Thanks in advance for any help.