[Saving Swift Custom Data Types To Disk] Code for saving objects to disk in Swift.

SaveSwiftToDisk.swift

import Foundation


// NOTE: The objects you wish to save to disk must conform to the Codable protocol
class Todo: Codable {
    let name: String
    private(set) var done: Bool = false
    
    init(name: String) {
        self.name = name
    }
    
    func toggleDone() {
        done = !done
    }
}


do {
  
    var todos = [Todo]()
    // MARK: Saving to/loading from disk
    
    let dataFilePath : URL! = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("Todos.plist")
    
    func save() {
        let encoder = PropertyListEncoder()
        if let data = try? encoder.encode(todos) {
            do {
                try data.write(to: dataFilePath)
            } catch {
                print("Error enconding todos array: \(error)")
            }
        }
    }
    
    func load() {
        if let data = try? Data(contentsOf: dataFilePath){
            let decoder = PropertyListDecoder()
            do {
                todos = try decoder.decode([Todo].self, from: data)
            } catch {
                print("Error decoding todos array")
            }
        }
    }
}