Codable2.swift

class Person: NSObject, Codable {
    
    
    var firstName: String
    var lastName: String
    
    override var description: String {
        return self.firstName + " " + self.lastName
    }

    init(firstName: String, lastName: String) {
        self.firstName = firstName
        self.lastName = lastName
        
        super.init()
    }
}

/// Save to file
let moi = Person(firstName: "Matt", lastName: "Neuburg")

if let moifile = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("moi.txt"){
    do {
        let moidata = try PropertyListEncoder().encode(moi)
        try moidata.write(to: moifile)
        print(moifile)
        print("saved data successfully")
    } catch let error {
        print("couldn't save \(error)")
    }
}


/// Read from file
if let moifile = try? FileManager.default.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).appendingPathComponent("moi.txt"){
    do {
        let persondata = try Data(contentsOf: moifile)
        let person = try PropertyListDecoder().decode(Person.self, from: persondata)
        print(person)
    } catch let error {
        print("couldn't save \(error)")
    }
}