swift - game countdown timer almost working - ios

Question

I'm using script (below), to use as a countdown for my game start, the script I've used is from Gourav Nayyar's YouTube video and works great for the first time it is called. However once the game goes through the reset process and the script is called again I only see 5 rather than 5 - 4 - 3 - 2 - 1 - GO!. If I remove one of the cals from my script then it works fine either in the reset func or when gameScene loads.
Here is the two calls in GameScene.swift
override func didMoveToView(view: SKView) {
var gamelaunchTimerView:TimerView = TimerView.loadingCountDownTimerViewInView(self.view!)
gamelaunchTimerView.startTimer()
func resetScene() {
//code removed from here
return countdown()
}
func countdown() {
var gamelaunchTimerView:TimerView = TimerView.loadingCountDownTimerViewInView(self.view!)
gamelaunchTimerView.startTimer()
}
Here is the Timer Code in GameLaunchTimer.swift as this is set up the countdown only works when first called and hangs on the second call.
//
// TimerView.swift
// GameLaunchTimer
//
// Created by Gourav Nayyar on 7/3/14.
// Copyright (c) 2014 Gourav Nayyar. All rights reserved.
//
let VIEW_ALPHA:CGFloat = 0.5
let TIMERVIEW_RADIUS:CGFloat = 50
let TIMER_LABEL_INITIAL_VAL:Int = 5
let BORDER_WIDTH:CGFloat = 2
var timerVal:Int = TIMER_LABEL_INITIAL_VAL;
var timer:NSTimer!
import UIKit
import QuartzCore
class TimerView :UIView {
struct Stored {
static var timerLbl:UILabel!
}
class func loadingCountDownTimerViewInView (_superView:UIView)-> TimerView
{
var timerView:TimerView = TimerView(frame:_superView.frame)
// timerView.backgroundColor = UIColor.blackColor().colorWithAlphaComponent(VIEW_ALPHA)
_superView.addSubview(timerView)
/* add a custom Circle view */
let refFrame:CGRect = CGRectMake(_superView.center.x-TIMERVIEW_RADIUS, _superView.center.y-TIMERVIEW_RADIUS, 2*TIMERVIEW_RADIUS, 2*TIMERVIEW_RADIUS)
var circleView:UIView = UIView(frame:refFrame)
circleView.layer.cornerRadius = TIMERVIEW_RADIUS
circleView.layer.borderColor = UIColor.whiteColor().CGColor
circleView.layer.borderWidth = BORDER_WIDTH
/* add a custom Label */
Stored.timerLbl = UILabel(frame:circleView.bounds)
Stored.timerLbl.text = "\(TIMER_LABEL_INITIAL_VAL)"
Stored.timerLbl.textColor = UIColor.whiteColor()
Stored.timerLbl.font = UIFont(name: "MarkerFelt-Thin", size: 40)
Stored.timerLbl.textAlignment = NSTextAlignment.Center
circleView.addSubview(Stored.timerLbl)
timerView.addSubview(circleView)
return timerView
}
func startTimer()
{
timer = NSTimer.scheduledTimerWithTimeInterval(1.0
, target: self, selector: Selector("updateTimer:"), userInfo: nil, repeats: true)
}
func updateTimer(dt:NSTimer)
{
timerVal--
if timerVal==0{
Stored.timerLbl.text = "GO!"
}else if timerVal<0{
timer.invalidate()
removeCountDownTimerView()
} else{
Stored.timerLbl.text = "\(timerVal)"
}
}
func removeCountDownTimerView()
{
var mySuperView:UIView = self.superview!
mySuperView.userInteractionEnabled = true
super.removeFromSuperview()
}
}

Answer 1

Define your variables under the class body;
import UIKit
import QuartzCore
class TimerView :UIView {
let VIEW_ALPHA:CGFloat = 0.5
let TIMERVIEW_RADIUS:CGFloat = 50
let TIMER_LABEL_INITIAL_VAL:Int = 5
let BORDER_WIDTH:CGFloat = 2
var timerVal:Int = TIMER_LABEL_INITIAL_VAL;
var timer:NSTimer!
... // other code
or, may be
let VIEW_ALPHA:CGFloat = 0.5
let TIMERVIEW_RADIUS:CGFloat = 50
let TIMER_LABEL_INITIAL_VAL:Int = 5
let BORDER_WIDTH:CGFloat = 2
import UIKit
import QuartzCore
class TimerView :UIView {
var timerVal:Int = TIMER_LABEL_INITIAL_VAL;
var timer:NSTimer!
... //other code

Answer 2

Assign nil to the timer after invalidating it: even though you are invalidating, the object state is still kept, resulting on states conflicts when creating a new instance of the timer, once that it runs in a different thread.