Storing a Boolean for access by Parse login - xcode

Question

I want to store a Boolean which grants access to certain options when a user logs in with Parse, but when I log in and declare it to be true, the variable seems to remain false.
I tried using NSUserDefaults and storing a global variable.
This is where I log in on one view controller:
PFUser.logInWithUsernameInBackground(userName.text!, password: password.text!) {
(user: PFUser?, error: NSError?) -> Void in
if user != nil {
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "accessGranted")
}
This functions fine and prints "Success" if I try.
On another view controller I have things like this:
addButton.enabled = NSUserDefaults.standardUserDefaults().boolForKey("accessGranted")

Answer 1

You can use NSUserDefaults to store your Bool globally this way:
Set your Bool this way:
NSUserDefaults.standardUserDefaults().setBool(false, forKey: "YourKey")
Then you can access it anywhere in your project this way:
let yourBool = NSUserDefaults.standardUserDefaults().boolForKey("YourKey")
Hope this will help.

Answer 2

NSUserDefaults:
Your are missing key component for it to work - you have to save the settings:
NSUserDefaults.standardUserDefaults().setBool(true, forKey: "accessGranted")
NSUserDefaults.standardUserDefaults().synchronize()
After that, your data that you stored will be stored to disk and you can access them anytime.
One-time assign to property:
After reading through comment, in order to access property only once, you can use something like this:
var accessGranted : Bool?
if accessGranted == nil {
accessGranted = yourValue
}
or as of Swift 2.0 (more on it here):
var accessGranted : Bool?
guard let granted = accessGranted else {
accessGranted = yourValue
}
Edit 2:
To notify second VC about changes, you can use multiple mechanisms (protocols / delegates etc.), but usually for this kind of message you would use Notifications (so your whole application can listen to that).
Notifications
You can use notifications like this:
In your "login" call, notify application that your access status changed, like this:
let NOTIFICATION_ACCESS_CHANGED_KEY = "NotificationAccessChanged"
NSNotificationCenter.defaultCenter().postNotificationName(NOTIFICATION_ACCESS_CHANGED)
then, everywhere where you are interested to listen to that change, put notification listener:
NSNotificationCenter.defaultCenter().addObserverForName(NOTIFICATION_ACCESS_CHANGED, object: nil, queue: nil) { (notification) -> Void in
// This block will be called when you post notification
self.doSomething()
}
Hope it helps!