enabling button in swift code

Question

I begin swift and i'm making an app ( a little game). The buttons of levels 2,... are not enabled because the user dont yet win the level 1 when the user install the application. then I want these buttons enabled everytime the user won the level. I wrote this in a file:

class levelList: UIViewController {
    @IBOutlet var blvl1: UIButton!
    @IBOutlet var blvl2: UIButton!
    @IBOutlet var blvl3: UIButton!

    var lvlWon1: Bool = false {
        didSet {
            blvl2?.enabled = lvlWon1

        }
    }

    var lvlWon2: Bool = false {
        didSet {
            blvl3?.enabled = lvlWon2
        }
    }
    let lvl1Default = NSUserDefaults.standardUserDefaults()
    let lvl2Default = NSUserDefaults.standardUserDefaults()


    override func viewDidLoad() {

        if (lvl1Default.objectForKey("lvlWon1") != nil){
            lvl1Default.setBool(true, forKey: "lvlWon1")
            lvlWon1 = lvl1Default.valueForKey("lvlWon1") as! Bool!
        }
        else{
            lvl1Default.setBool(false, forKey: "lvlWon1")
            lvlWon1 = lvl1Default.valueForKey("lvlWon1") as! Bool!
        }

        //
        if (lvl2Default.objectForKey("lvlWon2") != nil){
            lvl2Default.setBool(true, forKey: "lvlWon2")
            lvlWon2 = lvl2Default.valueForKey("lvlWon2") as! Bool!
        }
        else{
            lvl2Default.setBool(false, forKey: "lvlWon2")
            lvlWon2 = lvl2Default.valueForKey("lvlWon2") as! Bool!
        }

    }
}

and this in an other file:

class lvl1: UIViewController {

var levelList = levelList()
@IBOutlet var bNext: UIButton!
@IBAction func nextlvl(sender: UIButton) {
    levelList.lvlWon1 = true
    levelList.lvlWon1 = levelList.lvl1Default.valueForKey("lvlWon1") as! Bool!
    let lvl1Default = NSUserDefaults.standardUserDefaults()
    lvl1Default.setValue(listeNiveaux.lvlWon1, forKey:"lvlWon1")
    lvl1Default.synchronize()
}

//my problem is that all work finely when I wrote:

var lvlWon1: Bool = false {
    didSet {
        blvl2?.enabled = lvlWon1

    }
}

so when i won the lvl 1, the level2 button is enabled, but when i add

var lvlWon2: Bool = false {
    didSet {
        blvl3?.enabled = lvlWon2
    }
}

when I win the level1, the blvl2 and the blvl3 are enabled, I don't know why

I think it's because i save the data of all blvl but i'm not sure. thanks in advance and really sorry for my english, it's not my first language.

Answer 1

I finally found the solution :

 import UIKit

class ViewController: UIViewController {

 var defaults = NSUserDefaults.standardUserDefaults()

 @IBOutlet weak var startSecondLevelButton: UIButton!

 override func viewDidLoad() {
super.viewDidLoad()

self.checkLevelsStatuses()
    }

 func checkLevelsStatuses() {

startSecondLevelButton.enabled = false

if let lvlWon1 = defaults.objectForKey("lvlWon1") as? Bool {
    // if true - level finished
    if (lvlWon1) {
        startSecondLevelButton.enabled = true
    }
}else {
    defaults.setBool(false, forKey: "lvlWon1")
}

if let lvlWon2 = defaults.objectForKey("lvlWon2") as? Bool {

} else {
    defaults.setBool(false, forKey: "lvlWon2")
}

}

that was because the viewDidLoad was wrong.