NSSet dynamic object - Swift

Question

I'm tackling my first In-App Purchase set-up in my first Swift project. I'm trying to get an in-app bundle string from my UserDefaults, rather than bake it in as a fixed string, but I'm getting an error "fatal error: unexpectedly found nil while unwrapping an Optional value"

I'm calling my variable from the UserDefaults as follows:

var bundleIdentity : AnyObject!

NSUserDefaults.standardUserDefaults().synchronize()
    var userDefaults = NSUserDefaults.standardUserDefaults()

    if let myBundle: AnyObject? = userDefaults.objectForKey("bundle") {
        bundleIdentity = myBundle as String
    }

Now, I try to use it in my "getProductInfo" func:

func getProductInfo(){
    if SKPaymentQueue.canMakePayments(){
        let productID:NSSet = NSSet(object:self.bundleIdentity!)
        let request:SKProductsRequest = SKProductsRequest(productIdentifiers: productID)
        request.delegate = self
        request.start()
    }
}

I know the "bundleIdentity" is coming in, as I can printLn it as a string but I'm confused why I can't use it in the NSSet (object:self.bundleIdentity!) and get the error.

Any help would be much appreciated as I'm still a newbie to Swift!

Thanks

Answer 1

You have declared bundleIdentity as optional (using ?), and then you have told the machine that it definitely has a value (using !). It is throwing a temper tantrum because you lied to it.