Make NSTimer continue after closing and opening the game

Question

I am making a clicker game and I need to have my NSTimers continue after closing the application. I looked this up first but I could not find a suitable answer for Swift. I think I can use UserDefaults but I am not sure how to apply it. Sorry if this is a duplicate question, I know there is a lot of information on this.

var timerVar = NSTimer.scheduledTimerWithTimeInterval(4, target: self,     
selector: Selector("selectorName"), userInfo: nil, repeats: true)

func selectorName(){
    var ScoreDefault = NSUserDefaults.standardUserDefaults()
    ScoreDefault.setValue(Score, forKey: "Score")
    ScoreDefault.synchronize()
    Score+=1
    scoreLbl.text = "\(Score)"
}

Answer 1

Ok I figured it out. However it is not pretty but effective i'll post the code maybe someone can clean it up or use a different method. I ended up making another variable called scoreIncrementor then made a NSTimer in the didMoveToView that ran every second doing a simple equasion of score = score + scoreincrementor. Here is the code should anyone need it feel free to edit to your hearts delight. For this I also made another label just to see what is being added "tempScoreLbl".

 var ScoreIncrementor = Double()
 var Score = Double()
 var scoreLbl: UILabel!
 var tempscoreLbl: UILabel!

override func didMoveToView(view: SKView) {

var ScoreDefault = NSUserDefaults.standardUserDefaults()

    if (ScoreDefault.valueForKey("Score") != nil){
        Score = ScoreDefault.valueForKey("Score") as! Double
    }
    ScoreDefault.setValue(Score, forKey: "Score")
    ScoreDefault.synchronize()

var ScoreIncrementorDefault = NSUserDefaults.standardUserDefaults()

    if (ScoreIncrementorDefault.valueForKey("ScoreIncrementor") != nil){
         ScoreIncrementor = ScoreIncrementorDefault.valueForKey("ScoreIncrementor") as! Double
    }

    ScoreIncrementorDefault.setValue(ScoreIncrementor, forKey: "ScoreIncrementor")
    ScoreIncrementorDefault.synchronize()

    let scorePerSecond = NSTimer.scheduledTimerWithTimeInterval(1 , target: self, selector: Selector("permanentIncrementor"),userInfo: nil, repeats: true)

self.view?.addSubview(scoreLbl)
self.view?.addSubview(tempscoreLbl)
}


func permanentIncrementor(){
    Score = Score + ScoreIncrementor
    var ScoreDefault = NSUserDefaults.standardUserDefaults()
    ScoreDefault.setValue(Score, forKey: "Score")
    ScoreDefault.synchronize()
    scoreLbl.text = "\(Score)"

}

func gloveUpgrade(){
    if Score >= 50{

        let scorePerSecond = NSTimer.scheduledTimerWithTimeInterval(0 , target: self, selector: Selector("gloveUpgradeTimer"),userInfo: nil, repeats: false)
        var ScoreIncrementorDefault = NSUserDefaults.standardUserDefaults()
        ScoreIncrementorDefault.setValue(ScoreIncrementor, forKey: "ScoreIncrementor")
        ScoreIncrementorDefault.synchronize()
        Score-=50

        tempscoreLbl.text = "\(ScoreIncrementor)"

    }
}
func gloveUpgradeTimer(){
    //increase score per minute by .25
    var ScoreIncrementorDefault = NSUserDefaults.standardUserDefaults()
    ScoreIncrementorDefault.setValue(ScoreIncrementor, forKey: "ScoreIncrementor")
    ScoreIncrementorDefault.synchronize()

    ScoreIncrementor+=0.25
    tempscoreLbl.text = "\(ScoreIncrementor)"
}