NSUserDefaults messing with SegmentedControl - ios

Question

I have a simple expense tracker app that has at the top a Segmented control to change currency (Romanian currency, Euro and $ in this order). In my list manager I have methods that convert from one to another and in the view controller, based on the Segmented control, I call them accordingly.
My problem is the following: When the app starts, the selected currency is always the first - Ro currency. If I add some elements and then I quit the app with another currency selected, I guess NSUserDefaults synchronizes with those values. When I open the app again, Ro currency is again selected, but with the $/euro values. (Say I add 410 ron, which converted is ~$100. I select $ and kill the app from multitasking. When I open it up again, it show 100 ron, instead of 410). If a currency is selected and add a certain amount, it performs ok (if $ is selected and I add 100, when I switch the control to ron it displays 410). I guess I have to change something with the synchronization, but I can't figure out where and how.
EDIT2: Some code (sorry)
//This is the expenses class
import UIKit
class Expense: NSObject, NSCoding {
//MARK: Properties
var title:String?
var amount:Double?
init(title:String,amount:Double){
self.title = title
self.amount = amount
}
override init(){
super.init()
}
required init(coder aDecoder: NSCoder){
if let titleDecoded = aDecoder.decodeObjectForKey("title") as? String{
title = titleDecoded
}
if let amountDecoded = aDecoder.decodeObjectForKey("amount") as? Double{
amount = amountDecoded
}
}
func encodeWithCoder(aCoder: NSCoder) {
if let titleEncoded = title {
aCoder.encodeObject(titleEncoded, forKey:"title")
}
if let amountEncoded = amount {
aCoder.encodeObject(amountEncoded, forKey:"amount")
}
}
}
//The NSUserDefaultsManager
import UIKit
class NSUserDefaultsManager: NSObject {
static let userDefaults = NSUserDefaults.standardUserDefaults()
class func synchronize(){
let myData = NSKeyedArchiver.archivedDataWithRootObject(ExpenseManager.expenses)
NSUserDefaults.standardUserDefaults().setObject(myData, forKey: "expensearray")
NSUserDefaults.standardUserDefaults().synchronize()
}
class func initializeDefaults(){
if let expensesRaw = NSUserDefaults.standardUserDefaults().dataForKey("expensearray"){
if let expenses = NSKeyedUnarchiver.unarchiveObjectWithData(expensesRaw) as? [Expense]{
ExpenseManager.expenses = expenses
}
}
}
}
I call the initializeDefaults in the tableview manager in view did load, the synchronize in view did appear and in the App Delegate module, sync in applicationWillTerminate.
ANSWER
I found a solution - it was quite obvious. I found it in a Google Books - iOS 9 Programming Fundamentals by Matt Neuburg.
In the segmented control action I added the following
let c = self.currencySelector.selectedSegmentIndex
NSUserDefaults.standardUserDefaults().setObject(c, forKey: "selectedcurrency")
while in viewDidLoad I added
let c = NSUserDefaults.standardUserDefaults().objectForKey("selectedcurrency") as! Int
currencySelector.selectedSegmentIndex = c

Answer 1

sorry I don't have enough reputation to comment. But could you show the code, and Im guessing you're not synchronizing something or just not pulling it up in ViewDidLoad, etc.