How to save data using NSCoding - ios

Question

I got Score.swift and ScoreManager.swift.
My Score.swift looks like this:
class Score: NSObject, NSCoding {
let score:Int;
let dateOfScore:NSDate;
init(score:Int, dateOfScore:NSDate) {
self.score = score;
self.dateOfScore = dateOfScore;
}
required init(coder: NSCoder) {
self.score = coder.decodeObjectForKey("score") as! Int;
self.dateOfScore = coder.decodeObjectForKey("dateOfScore") as! NSDate;
super.init()
}
func encodeWithCoder(coder: NSCoder) {
coder.encodeObject(self.score, forKey: "score")
coder.encodeObject(self.dateOfScore, forKey: "dateOfScore")
}
}
My ScoreManager.swift looks like this:
class ScoreManager {
var scores:Array<Score> = [];
init() {
// load existing high scores or set up an empty array
let documentsPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as NSString
let path = documentsPath.stringByAppendingPathComponent("Scores.plist")
let fileManager = NSFileManager.defaultManager()
// check if file exists
if !fileManager.fileExistsAtPath(path) {
// create an empty file if it doesn't exist
if let bundle = NSBundle.mainBundle().pathForResource("Scores", ofType: "plist") {
do {
try fileManager.copyItemAtPath(bundle, toPath: path)
} catch {
}
}
}
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 Scores, if possible
let scoreArray: AnyObject? = NSKeyedUnarchiver.unarchiveObjectWithData(rawData);
self.scores = scoreArray as? [Score] ?? [];
}
}
func save() {
// find the save directory our app has permission to use, and save the serialized version of self.scores - the Scores array.
let saveData = NSKeyedArchiver.archivedDataWithRootObject(self.scores);
let paths = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true) as NSArray;
let documentsDirectory = paths.objectAtIndex(0) as! NSString;
let path = documentsDirectory.stringByAppendingPathComponent("Scores.plist");
saveData.writeToFile(path, atomically: true);
}
// a simple function to add a new high score, to be called from your game logic
// note that this doesn't sort or filter the scores in any way
func addNewScore(newScore:Int) {
let newScore = Score(score: newScore, dateOfScore: NSDate());
self.scores.append(newScore);
self.save();
}
}
My question is this:
How do I call these NSCoding stuff to save data from the actual gameView scene?

Answer 1

I strongly urged you to read a book or at least a tutorial on iOS programming. But here's the low down of it.
class ViewController: UIViewController {
let scoreManager = ScoreManager()
// Save the score to file. Hook it up to a button or label in your view
#IBAction func save (sender: AnyObject) {
scoreManager.save()
}
}
If you don't know how to connect a button/label to an #IBAction, please find a tutorial on Google.