NSCoding gamedata not saved swift - ios

Question

At the moment, my data does not get retrieved in another new session and it uses the default values. Do I have to have an existing plist file for this to work? I tried using an existing file with no luck.
I followed the guide here http://battleofbrothers.com/sirryan/saving-game-data-in-spritekit
class GameData : NSObject, NSCoding {
/// Data to save
var variableC : Int = 3
/// Create of shared instance
class var sharedInstance: GameData {
struct Static {
static var instance: GameData?
static var token: dispatch_once_t = 0
}
dispatch_once(&Static.token) {
var gamedata = GameData()
if let savedData = GameData.loadGame() {
gamedata = savedData
}
Static.instance = gamedata
}
return Static.instance!
}
override init() {
super.init()
}
required init(coder: NSCoder) {
super.init()
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(GameData.sharedInstance, forKey: "GameData")
}
class func loadGame() -> GameData? {
// load existing high scores or set up an empty array
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentsDirectory = paths[0] as! String
let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist")
let fileManager = NSFileManager.defaultManager()
// check if file exists
if !fileManager.fileExistsAtPath(path) {
// create an empty file if it doesn't exist
println("File doesn't exist")
if let bundle = NSBundle.mainBundle().pathForResource("DefaultFile", ofType: "plist") {
fileManager.copyItemAtPath(bundle, toPath: path, error:nil)
}
}
if let rawData = NSData(contentsOfFile: path) {
// do we get serialized data back from the attempted path?
// if so, unarchive it into an AnyObject, and then convert to an array of HighScores, if possible
if let data = NSKeyedUnarchiver.unarchiveObjectWithData(rawData) as? GameData {
println("We loaded the data!")
return data
}
}
println("we returned Nil")
return nil
}
func save() {
// find the save directory our app has permission to use, and save the serialized version of self.scores - the HighScores array.
let saveData = NSKeyedArchiver.archivedDataWithRootObject(GameData.sharedInstance);
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray;
let documentsDirectory = paths.objectAtIndex(0)as! NSString;
let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist");
saveData.writeToFile(path, atomically: true);
}
}
I load the gamedata in the init function with this
var gameData: GameData = GameData.sharedInstance
Updating the data
gameData.variableC = gameData.variableC + 1
gameData.save()
println(gameData.variableC)

Answer 1

You save the data but don't use it in your init. In initWithCoder:
required init(coder: NSCoder) {
super.init()
GameData.shaderInstance = coder.decodeObjectForKey("GameData")
}

Answer 2

Like Jozsef said, I forgot to decode the data. However I need to decode each of the individual variables and then copy it over to the GameData for it to work.
Here's
class GameData : NSObject, NSCoding {
/// Data to save
var variableC : Int! = 3
/// Create of shared instance
class var sharedInstance: GameData {
struct Static {
static var instance: GameData?
static var token: dispatch_once_t = 0
}
dispatch_once(&Static.token) {
var gamedata = GameData()
if let savedData = GameData.loadGame() {
gamedata.variableC = savedData.variableC
}
Static.instance = gamedata
}
return Static.instance!
}
override init() {
super.init()
}
required init(coder: NSCoder) {
super.init()
self.variableC = coder.decodeObjectForKey("variableC") as? Int
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(GameData.sharedInstance.variableC, forKey: "variableC")
}
class func loadGame() -> GameData? {
// load existing high scores or set up an empty array
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
let documentsDirectory = paths[0] as! String
let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist")
let fileManager = NSFileManager.defaultManager()
// check if file exists
if !fileManager.fileExistsAtPath(path) {
// create an empty file if it doesn't exist
println("File doesn't exist")
if let bundle = NSBundle.mainBundle().pathForResource("DefaultFile", ofType: "plist") {
fileManager.copyItemAtPath(bundle, toPath: path, error:nil)
}
}
if let rawData = NSData(contentsOfFile: path) {
// do we get serialized data back from the attempted path?
// if so, unarchive it into an AnyObject, and then convert to an array of HighScores, if possible
if let data = NSKeyedUnarchiver.unarchiveObjectWithData(rawData) as? GameData {
println("We loaded the data!")
return data
}
}
return nil
}
func save() {
// find the save directory our app has permission to use, and save the serialized version of self.scores - the HighScores array.
let saveData = NSKeyedArchiver.archivedDataWithRootObject(GameData.sharedInstance);
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray;
let documentsDirectory = paths.objectAtIndex(0)as! NSString;
let path = documentsDirectory.stringByAppendingPathComponent("GameData.plist");
saveData.writeToFile(path, atomically: true);
}
}