如何在Swift 4中存储开关值和日期

Question

我正在制作待办事项列表应用程序。我希望能够保存我的开关选择以及开关打开的日期，以表明列表中的项目已完成。我存储了数组，但我不知道如何保存日期和切换。我现在只会显示第一个项目。

这是我的TodolistManager：

import Foundation
class ToDoListManager {
private static let userDefaults = UserDefaults.standard
private static let listKey = "ToDoListKey"
var toDoItems: [ToDoItem]
var completedSwitch: Bool
init() {
    self.toDoItems = ToDoListManager.retrieve() ?? [ToDoItem]()
 //* I don't know how to initialize my completedSwitch
 /*   self.completedSwitch =
 *//
}
func getItems() -> [ToDoItem] {
    return self.toDoItems
}
func numberItems() -> Int {
    return self.toDoItems.count
}
func addItem(item: ToDoItem) {
    self.toDoItems.append(item)
    ToDoListManager.store(items: self.toDoItems)
}
func removeItem(index: Int) {
    self.toDoItems.remove(at: index)
}
func getFirstItem() -> ToDoItem? {
    return self.toDoItems.first
}
func getDateCompleted() -> Bool {
    if completedSwitch == true{
        return true;
    } else {
        return false;
    }
}
private class func store(items:[ToDoItem]) {
    let encoder = JSONEncoder()
    if let encoded = try? encoder.encode(items) {
        userDefaults.set(encoded, forKey: listKey)
    }
    userDefaults.synchronize()
}
private class func retrieve() -> [ToDoItem]? {
    if let items = userDefaults.value(forKey: listKey) as? Data {
        let decoder = JSONDecoder()
        if let objectsDecoded = try? decoder.decode(Array.self, from: 
items) as [ToDoItem] {
            return objectsDecoded
        }
        else {
            return nil
        }
    }
    else {
        return nil
    }
}
}

我的VC：

import UIKit
class DetailViewController: UIViewController {
@IBOutlet weak var descriptionLabel: UILabel!
@IBOutlet weak var dateAddedLabel: UILabel!
@IBOutlet weak var completed: UISwitch!
@IBOutlet weak var dateCompletedLabel: UILabel!
@IBAction func completedSwitch(_ sender: UISwitch) {
    if sender.isOn {
        dateCompletedLabel.isHidden = true
    }
    else {
        dateCompletedLabel.isHidden = false
    }
}
var toDoItem: ToDoItem! {
    didSet(newItem) {
        self.refreshUI()
    }
}
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    refreshUI()
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
func refreshUI() {
    if(toDoItem == nil) {
        return
    }
    descriptionLabel?.text = toDoItem.itemDescription
    completed.setOn(toDoItem.completed, animated: true)
    dateAddedLabel?.text = toDoItem.getDateAdded()
    dateCompletedLabel?.text = toDoItem.getDateCompleted()
    }
}

Answer 1

这只是一个示例。

您也可以通过VC中任何地方的completedSwitch.isOn获得其值。

@IBOutlet weak var descriptionLabel: UILabel!
@IBOutlet weak var dateAddedLabel: UILabel!
@IBOutlet weak var completedSwitch: UISwitch!
@IBAction func completedSwitch(_ sender: UISwitch) {
    if sender.isOn {
        ///// do your stuffs if completed
    }
    else {
        ///// do your stuffs if NOT completed
    }
}
var toDoItem: ToDoItem! {
    didSet(newItem) {
        self.refreshUI()
    }
}
override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view.
    refreshUI()
}
override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}
func refreshUI() {
    if(toDoItem == nil) {
        return
    }
    descriptionLabel?.text = toDoItem.itemDescription
    completedSwitch?.setOn(toDoItem.completed, animated: true)
    dateAddedLabel?.text = toDoItem.getDateAdded()
    }
}