Remember the high score in 2 ViewControllers in swift - iphone

Question

Iv'e got 2 ViewControllers, In the first one the user get the points and the high score label.
In the second ViewController, the code calculates if the user has broke the old high score, if yes - it changes, of course. BUT! when I quit the app and start playing again, the high score label show my last score and not the highest score.
Here is my code:
First ViewController:
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
defaults.synchronize()
highScore.text = String(stringInterpolationSegment: oldScore)
Second ViewController:
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
if score > oldScore {
defaults.setInteger(score, forKey: "oldScore")
defaults.synchronize()
var money = defaults.valueForKey("oldScore") as! Int
oldScore = money
} else {
defaults.setInteger(oldScore, forKey: "oldScore")
defaults.synchronize()
var money = defaults.valueForKey("oldScore") as! Int
oldScore = money
}
I also got var oldScore = Int() in the view controller code but outside the class of the view controller.
In addition, I have a "Switch" button that starts with state of "ON". But sometimes me/the user want to change it to off, how can I save it to be the user's choice after I quit the app and relaunch?

Answer 1

First of all check if NSUserDefault for oldScore is set. If it is not set only then initialise the oldScore, otherwise don't. Just fetch the value of oldScore and compare it with the new score and set the value accordingly
if (NSUserDefaults.standardUserDefaults().objectForKey(oldScore) == nil) {
oldScore = Int()
}
In your Second View Controller, first of all put NSUserDefault's oldScore's value into a variable and then check if it is equal to your Score. If it is only then set it like this :
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
var oldScoreCheck = defaults.valueForKey("oldScore") as! Int
if score > oldScoreCheck {
defaults.setInteger(score, forKey: "oldScore")
defaults.synchronize()
}

Answer 2

In your first view controller make the following change.
let defaults: NSUserDefaults = NSUserDefaults.standardUserDefaults()
if defaults.integerForKey("oldScore") != nil
{
highScore.text = defaults.integerForKey("oldScore")
}
else
{
highScore.text = 0
}
There might be some changes required dependent on the variable type of highScore.
Hope this might be helpful.

Answer 3

According Apple's documentation you should register all default values before using them.
In AppDelegate in application:didFinishLaunchingWithOptions: add this code to register the key oldScore to have a reliable default value. A key switchState is also registered for the mentioned "Switch" button.
let defaults = NSUserDefaults.standardUserDefaults()
let defaultValues = ["oldScore" : 0, "switchState" : "ON"]
defaults.registerDefaults(defaultValues)
In the first view controller retrieve the high score value. If no value has been ever written to disk, the registered default value (0) is taken. You could read the value for the "Switch" button respectively.
let defaults = NSUserDefaults.standardUserDefaults()
let oldScore = defaults.integerForKey("oldScore")
let buttonState = defaults.stringForKey("switchState")
highScore.text = "\(oldScore)"
In the second view controller save the high score if changed
let defaults = NSUserDefaults.standardUserDefaults()
let oldScore = defaults.integerForKey("oldScore")
if score > oldScore {
defaults.setInteger(score, forKey: "oldScore")
defaults.synchronize()
oldScore = score
}