NSUserDefaults - 如何存储自定义对象数组(目标) [英] NSUserDefaults - How can I store an array of custom objects (Goals)
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问题描述
如何存储我在NSUserDefaults中创建的Goal类型的对象数组? (快速)
How can I store an array of objects of type Goal which I have created in NSUserDefaults? (in swift)
以下是代码:
func saveGoalList ( newGoalList : [Goal] ){
let updatedGoalList = newGoalList;
NSUserDefaults.standardUserDefaults().setObject(updatedGoalList, forKey: "GoalList")
NSUserDefaults.standardUserDefaults().synchronize()
}
class GoalsViewController: MainPageContentViewController, UITableViewDelegate, UITableViewDataSource {
@IBOutlet var tableView: GoalsTableView!
var cell = GoalTableViewCell()
var goalsArray : Array<Goal> = [] //
override func viewDidLoad() {
super.viewDidLoad()
self.tableView.delegate = self
self.tableView.dataSource = self
if var storedGoalList: [Goal] = NSUserDefaults.standardUserDefaults().objectForKey("GoalList") as? [Goal]{
goalsArray = storedGoalList;
}
var goal = Goal(title: "Walk the Dog")
goalsArray.append(goal)
saveGoalList(goalsArray)
self.tableView?.reloadData()
tableView.estimatedRowHeight = 44.0
tableView.rowHeight = UITableViewAutomaticDimension
self.xpnotificationView.alpha = 0.0
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return goalsArray.count //to ensure there is always an extra cell to fill in.
}
func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell { //recreate the cell and try using it.
cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as GoalTableViewCell
cell.goalTextField.text = goalsArray[indexPath.row].title as String!
cell.checkmarkImageView.visible = goalsArray[indexPath.row].checkmarked as Bool!
if (cell.checkmarkImageView.visible == true) {
cell.blackLineView.alpha = 1.0
} else {
cell.blackLineView.alpha = 0.0
}
return cell
}
}
我知道只有某些数据类型适用于NSUserDefaults。任何人都可以帮我理解我是如何做到的吗?
I understand that there are only certain data types that work with NSUserDefaults. Could anyone help me understand how I could do that?
编辑:现在目标继承自NSObject。
Right now Goal inherits from NSObject.
推荐答案
我正在使用NSCoding从学习项目中发布代码来存储对象。功能齐全,随时可用。一个存储游戏变量等的数学游戏。
I am posting code from a learning project I did to store objects using NSCoding. Fully functional and ready to use. A math game that was storing game variables, etc.
//********This class creates the object and properties to store********
import Foundation
class ButtonStates: NSObject {
var sign: String = "+"
var level: Int = 1
var problems: Int = 10
var time: Int = 30
var skipWrongAnswers = true
func encodeWithCoder(aCoder: NSCoder!) {
aCoder.encodeObject(sign, forKey: "sign")
aCoder.encodeInteger(level, forKey: "level")
aCoder.encodeInteger(problems, forKey: "problems")
aCoder.encodeInteger(time, forKey: "time")
aCoder.encodeBool(skipWrongAnswers, forKey: "skipWrongAnswers")
}
init(coder aDecoder: NSCoder!) {
sign = aDecoder.decodeObjectForKey("sign") as String
level = aDecoder.decodeIntegerForKey("level")
problems = aDecoder.decodeIntegerForKey("problems")
time = aDecoder.decodeIntegerForKey("time")
skipWrongAnswers = aDecoder.decodeBoolForKey("skipWrongAnswers")
}
override init() {
}
}
//********Here is the data archiving and retrieving class********
class ArchiveButtonStates:NSObject {
var documentDirectories:NSArray = []
var documentDirectory:String = ""
var path:String = ""
func ArchiveButtons(#buttonStates: ButtonStates) {
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("buttonStates.archive")
if NSKeyedArchiver.archiveRootObject(buttonStates, toFile: path) {
//println("Success writing to file!")
} else {
println("Unable to write to file!")
}
}
func RetrieveButtons() -> NSObject {
var dataToRetrieve = ButtonStates()
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("buttonStates.archive")
if let dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? ButtonStates {
dataToRetrieve = dataToRetrieve2 as ButtonStates
}
return(dataToRetrieve)
}
}
the following is in my ViewController where the game is played. Only showing the relevant code for retrieving and storing objects
class mathGame: UIViewController {
var buttonStates = ButtonStates()
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(animated)
//set inital view
//retrieving a stored object & placing property into local class variables
buttonStates = ArchiveButtonStates().RetrieveButtons() as ButtonStates
gameData.sign = buttonStates.sign
gameData.level = buttonStates.level
gameData.problems = buttonStates.problems
gameData.time = buttonStates.time
}
override func viewWillDisappear(animated: Bool) {
super.viewWillDisappear(animated)
//storing the object
ArchiveButtonStates().ArchiveButtons(buttonStates: buttonStates)
}
}
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