Unable to decode a NSObject in Swift - swift

Question

I am having a problem decoding an object after I encode it in Swift.
Here is my class:
class Player: NSObject, NSCoding {
var score:Int = 0
init(difficulty: Int!) {
super.init()
}
required init(coder aDecoder: NSCoder) {
score = aDecoder.decodeObjectForKey("score") as Int
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(score, forKey: "score")
}
Here is when I am encoding and decoding:
let data = NSKeyedArchiver.archivedDataWithRootObject(player)
let newPlayer = NSKeyedUnarchiver.unarchiveObjectWithData(data) as Player
It crashes everytime when I try to unarchive it. Anybody have any reasons why?
P.S. I have no idea why my code isn't formatted. I have it indented 4 spaces over! Sorry about that!

Answer 1

Here is what I did to get it working:
Created an instance of player in my App Delegate
You can call this anywhere if your application UIApplication.sharedApplication().player

Answer 2

For storing arrays of Player objects here are the NSObject classes:
import Foundation
class Player: NSObject {
var score:Int = 0
func encodeWithCoder(aCoder: NSCoder!) {
aCoder.encodeInteger(score, forKey: "score")
}
init(coder aDecoder: NSCoder!) {
score = aDecoder.decodeIntegerForKey("score")
}
override init() {
}
}
class ArchivePlayer:NSObject {
var documentDirectories:NSArray = []
var documentDirectory:String = ""
var path:String = ""
func savePlayerArray(#playerArray: [Player]) {
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("playersArray.archive")
if NSKeyedArchiver.archiveRootObject(playerArray, toFile: path) {
println("Success writing to file!")
} else {
println("Unable to write to file!")
}
}
func retrievePlayerArray() -> NSObject {
var dataToRetrieve = [Player]()
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("playersArray.archive")
if let dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? [Player] {
dataToRetrieve = dataToRetrieve2
}
return(dataToRetrieve)
}
}
Here is the ViewController:
import UIKit
class ViewController: UIViewController {
var player1 = Player()
var player2 = Player()
var player3 = Player()
var playerArchiveArray = [Player]()
override func viewDidLoad() {
super.viewDidLoad()
player1.score = 12
player2.score = 22
player3.score = 32
playerArchiveArray = [player1, player2, player3]
ArchivePlayer().savePlayerArray(playerArray: playerArchiveArray)
var playerRetrieveArray = ArchivePlayer().retrievePlayerArray() as [Player]
for player in playerRetrieveArray {
println(player.score)
}
}
}

Answer 3

This should work. I will post a separate answer if you wish to save an array of Player objects.
Two NSObject classes:
import Foundation
class Player: NSObject {
var score:Int = 0
func encodeWithCoder(aCoder: NSCoder!) {
aCoder.encodeInteger(score, forKey: "score")
}
init(coder aDecoder: NSCoder!) {
score = aDecoder.decodeIntegerForKey("score")
}
override init() {
}
}
class ArchivePlayer:NSObject {
var documentDirectories:NSArray = []
var documentDirectory:String = ""
var path:String = ""
func savePlayer(#player: Player) {
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("players.archive")
if NSKeyedArchiver.archiveRootObject(player, toFile: path) {
println("Success writing to file!")
} else {
println("Unable to write to file!")
}
}
func retrievePlayer() -> NSObject {
var dataToRetrieve = Player()
documentDirectories = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)
documentDirectory = documentDirectories.objectAtIndex(0) as String
path = documentDirectory.stringByAppendingPathComponent("players.archive")
if let dataToRetrieve2 = NSKeyedUnarchiver.unarchiveObjectWithFile(path) as? Player {
dataToRetrieve = dataToRetrieve2 as Player
}
return(dataToRetrieve)
}
}
And then in the ViewController:
import UIKit
class ViewController: UIViewController {
var player = Player()
override func viewDidLoad() {
super.viewDidLoad()
player.score = 22
ArchivePlayer().savePlayer(player: player)
let playerToRetrieve = ArchivePlayer().retrievePlayer() as Player
println(playerToRetrieve.score)
}
}
This demonstrates archiving and unarchiving to file. Printing "Success writing to file!" to demonstrate the archiving. Printing the stored object player.score to demonstrate unarchiving.