如何对对象进行序列化和反序列化？

NSCoding.swift

//--------------------------------------------------------  define Model--------------------------------------------------

import Foundation

class TodoItem: NSObject, NSCoding {
    
    // Attribute of model
    var name: String = ""
    var isFinished: Bool = false
    
    // init method
    override init() {
        super.init()
    }
    
    init(name: String, isFinished: Bool) {
        self.name = name
        self.isFinished = isFinished
    }
    
    // change finish state method
    func toggleFinished() {
        isFinished = !isFinished
    }
    
    
    // About NSCoding
    required init?(coder aDecoder: NSCoder) {
        name = aDecoder.decodeObject(forKey: "Name") as! String
        isFinished = aDecoder.decodeBool(forKey: "isFinished")
        
        super.init()
    }
    
    func encode(with aCoder: NSCoder) {
        aCoder.encode(name, forKey: "Name")
        aCoder.encode(isFinished, forKey: "isFinished")
    }
}

------------------------------------------ some get path methods  -----------------------------------------------

// Get document directory path
func documentsDirectory() -> URL {
    let path = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)

    return path[0]
}

// Add plist file name and get file path
func dataFilePath() -> URL {
    return documentsDirectory().appendingPathComponent("TodoList.plist")
}



//----------------------------------------  save and load methods ---------------------------------------------------

func saveTodoItems() {
    let data = NSMutableData()
    let archiver = NSKeyedArchiver(forWritingWith: data)

    archiver.encode(todoItems, forKey: "TodoItems")
    archiver.finishEncoding()

    data.write(to: dataFilePath(), atomically: true)
}

func loadTodoItems() {

    let path = dataFilePath()

    if let data = try? Data(contentsOf: path) {
        let unarchiver = NSKeyedUnarchiver(forReadingWith: data)
        todoItems = unarchiver.decodeObject(forKey: "TodoItems") as! [TodoItem]

        unarchiver.finishDecoding()
    }
}