ios - NSUser Defaults - 将 3 个变量保存在一起然后获取

Question

我在我的应用中使用 NSUserDefaults 进行持久存储。在这种游戏中，游戏结束后，必须存储得分以及日期和名称(由用户输入)，然后将其显示在表格 View 中。到目前为止我的代码是:

import UIKit

class LeaderboardVC: UIViewController, UITableViewDataSource, UITableViewDelegate {

var finishedGame = 0
var gameScore:Int! = 0
var name:String!
var date:String!
var score:Int!
var scoreData = [NSArray]()
var defaults = UserDefaults.standard

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    if finishedGame == 1{
        saveNew()
    }

    self.tableView.delegate = self
    self.tableView.dataSource = self


}

override func viewWillAppear(_ animated: Bool) {

    self.navigationController?.isNavigationBarHidden = false
    self.navigationItem.hidesBackButton = true



}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}

func saveNew() {

    let enterNameAlert = UIAlertController(title: "Please Enter Your Name", message: "This will be used to place you in the leaderboards", preferredStyle: .alert)

    enterNameAlert.addTextField { (textField:UITextField) -> Void in
        textField.placeholder = "Name"
        textField.autocapitalizationType = UITextAutocapitalizationType.words
        textField.autocorrectionType = UITextAutocorrectionType.no
        textField.clearsOnBeginEditing = true
        textField.clearsOnInsertion = true
        textField.clearButtonMode = UITextFieldViewMode.always
        textField.keyboardType = UIKeyboardType.default

    }
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

    let confirmAction = UIAlertAction(title: "Confirm", style: .default) { (action:UIAlertAction) in

        let currentTime = Date()
        let timeFormatter = DateFormatter()
        timeFormatter.locale = Locale.current
        timeFormatter.dateFormat = "HH:mm dd/MM/yy"
        let convertedTime = timeFormatter.string(from: currentTime) //date
        let enteredName = enterNameAlert.textFields?.first?.text //name

        // set object of date,name and score here
    }

    enterNameAlert.addAction(cancelAction)
    enterNameAlert.addAction(confirmAction)
    self.present(enterNameAlert, animated: true, completion: nil)

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! LeaderBoardCell

    cell.dateLabel?.text =
    cell.dateLabel.adjustsFontSizeToFitWidth = true
    cell.scoreLabel?.text =
    cell.scoreLabel.adjustsFontSizeToFitWidth = true
    cell.nameLabel?.text =
    cell.nameLabel.adjustsFontSizeToFitWidth = true

    return cell
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return scoreData.count
}

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}
}

单元格中有 3 个标签，分别对应必须显示的 3 个值。如何使用 NSUserDefaults 设置这些值(它们必须在一起，例如 Score:500 与 name:John 等)？

编辑 - 新代码

import UIKit

LeaderboardVC 类:UIViewController、UITableViewDataSource、UITableViewDelegate {

var finishedGame = 0
var gameScore:Int! = 0
var defaults = UserDefaults.standard
var newUserArray = NSMutableArray()

@IBOutlet weak var tableView: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    if finishedGame == 1{
        saveNew()
    }

    self.tableView.delegate = self
    self.tableView.dataSource = self


}

override func viewWillAppear(_ animated: Bool) {

    self.navigationController?.isNavigationBarHidden = false
    self.navigationItem.hidesBackButton = true



}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}

func saveNew() {

    let enterNameAlert = UIAlertController(title: "Please Enter Your Name", message: "This will be used to place you in the leaderboards", preferredStyle: .alert)

    enterNameAlert.addTextField { (textField:UITextField) -> Void in
        textField.placeholder = "Name"
        textField.autocapitalizationType = UITextAutocapitalizationType.words
        textField.autocorrectionType = UITextAutocorrectionType.no
        textField.clearsOnBeginEditing = true
        textField.clearsOnInsertion = true
        textField.clearButtonMode = UITextFieldViewMode.always
        textField.keyboardType = UIKeyboardType.default

    }
    let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)

    let confirmAction = UIAlertAction(title: "Confirm", style: .default) { (action:UIAlertAction) in

        let currentTime = Date()
        let timeFormatter = DateFormatter()
        timeFormatter.locale = Locale.current
        timeFormatter.dateFormat = "HH:mm dd/MM/yy"
        let convertedTime = timeFormatter.string(from: currentTime)
        let enteredName = enterNameAlert.textFields?.first?.text

        let newUserData = self.defaults.object(forKey: "UserData") as! NSArray
        let newUserArray = NSMutableArray(array: newUserData)

        let newUserRecord = [
            "Name"  : enteredName!,
            "Score" : String(self.gameScore),
            "Date"    : convertedTime
            ] as [String : String]

        newUserArray.add(newUserRecord)
        self.defaults.set(newUserArray, forKey: "UserData")
        self.defaults.synchronize()
        print(newUserArray)
        print("hello")
        print(self.defaults)


    }

    enterNameAlert.addAction(cancelAction)
    enterNameAlert.addAction(confirmAction)
    self.present(enterNameAlert, animated: true, completion: nil)

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! LeaderBoardCell
    let userData = defaults.object(forKey: "UserData") as! NSArray

    cell.dateLabel?.text = "Date: \(((userData.object(at: indexPath.row) as! [String:Any])["Date"] as! String))"
    cell.dateLabel.adjustsFontSizeToFitWidth = true
    cell.scoreLabel?.text = "Score: \(((userData.object(at: indexPath.row) as! [String:Any])["Score"] as! String))"
    cell.scoreLabel.adjustsFontSizeToFitWidth = true
    cell.nameLabel?.text = "Name: \(((userData.object(at: indexPath.row) as! [String:Any])["Name"] as! String))"
    cell.nameLabel.adjustsFontSizeToFitWidth = true

    return cell
}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return newUserArray.count
}

func numberOfSections(in tableView: UITableView) -> Int {
    return 1
}

}

Answer 1

您可以将字典设置为 UserDefaults(即一次设置 3 个值)。要制作排行榜，您需要将此字典保存在数组中。

let scoreDict: [String : Any] = ["name": "John", "score": 500, "date": NSDate()]
let defaults = UserDefaults.standard

let scoresKey = "scores"

var currentScores: [Any] = defaults.array(forKey: scoresKey) ?? []
currentScores.append(scoreDict)

defaults.set(currentScores, forKey: scoresKey)
defaults.synchronize()