Simplify Swift data struct - swift

Question

Any suggestion on how to simplify this data struct? The data will be saved as a dictionary on the user's drive and when I read the data from the drive I have to convert them back to Member for easy accessing the properties.
I would like to have it typesafe.
struct Member {
var id: Int
var firstname: String
var lastname: String
var address: String?
var zipCode: Int?
var city: String?
enum Value: String {
case id = "id"
case firstname = "firstname"
case lastname = "lastname"
case address = "address"
case zipCode = "zipCode"
case city = "city"
}
var member: [String:Any] {
return [
Value.id.rawValue:Int(),
Value.firstname.rawValue:firstname,
Value.lastname.rawValue:lastname,
Value.address.rawValue:address ?? String(),
Value.zipCode.rawValue:zipCode ?? Int(),
Value.city.rawValue:city ?? String()
]
}
}
func memberToDic(member: Member) -> [String:Any] {
return [
Member.Value.firstname.rawValue:member.firstname,
Member.Value.lastname.rawValue:member.lastname,
Member.Value.address.rawValue:member.address ?? String(),
Member.Value.zipCode.rawValue:member.zipCode ?? Int(),
Member.Value.city.rawValue:member.city ?? String()
]
}
func dicToMember(dic: [String:Any]) -> Member {
return Member(
id: dic[Member.Value.id.rawValue] as! Int,
firstname: dic[Member.Value.firstname.rawValue] as! String,
lastname: dic[Member.Value.lastname.rawValue] as! String,
address: dic[Member.Value.address.rawValue] as? String,
zipCode: dic[Member.Value.zipCode.rawValue] as? Int,
city: dic[Member.Value.city.rawValue] as? String
)
}

Answer 1

Almost certainly, this is the correct implementation:
struct Member: Codable {
var id: Int
var firstName: String // "first name" is two words, so capitalize "name"
var lastName: String
var address: String // "No address" should be empty, not nil
var zipCode: String // ZIP codes are not integers
var city: String // "No city" should be empty, not nil
}
In order to save this as a plist, use PropertyListEncoder:
let data = try PropertyListEncoder().encode(member)
To read it, use PropertyListDecoder.
Codable automatically creates key mappings for your properties, so there's no need for Value.
You should strongly avoid creating or consuming [String: Any] dictionaries. These exist mostly due to Objective-C interfaces that could not generate strong types.
If address, zipCode, and city all should be set together, or not set together, then you should collect them into a single struct:
struct Address: Codable {
var streetAddress: String
var zipCode: String
var city: String
}
struct Member: Codable {
var id: Int
var firstName: String // "first name" is two words, so capitalize "name"
var lastName: String
var address: Address?
}
In this case, and Optional makes sense because "empty" is not the same thing as "missing."