iOS Presenting a UIAlertController from a class?

[bitfactory]

Hi.

I'm attempting to present a UIAlertController from a class (an extension, actually), but I'm having trouble trying to reference the View I'm coming from to present it.

In the class (in some if/let statements), I have all the pieces of the UIAlertController:

let alertController = UIAlertController(title: "Error", message: "Error message to go here.", preferredStyle: .Alert)                        

let cancelAction = UIAlertAction(title: "Cancel", style: .Cancel) { (action) in
println(action)                        
}
alertController.addAction(cancelAction)

let destroyAction = UIAlertAction(title: "Delete", style: .Destructive) { (action) in
// my action is here
}

alertController.addAction(destroyAction)

self.presentViewController(alertController, animated: true, completion: nil)

The problem is in the last line... obviously self.presentViewController isn't going to work. As a matter of fact, self.presentViewController isn't even valid since the class didn't even have a member that allowed that.

So in an attempt to fix it, I declared a UIViewController in the class

var targetView: UIViewController!

which enabled the .presentViewController method - but how do I reference the original active view in order to present this?

Currently I just have this...

self.targetView.presentViewController(alertController, animated: true, completion: nil)

The app crashes right now when it gets here (found nil while unwrapping Optional) - which is most likely due to the declared value.

MyViewController
- network call using a class
- in the network call class closure i'm trying to present this AlertViewController in MyViewController

Any ideas?

Thanks!

 

[PhoneyDeveloper]

Either you pass in a valid view controller when this class is built or you return an error (NSError or something like that) to the caller and the caller displays the alert.

 

[bitfactory]

Either you pass in a valid view controller when this class is built or you return an error (NSError or something like that) to the caller and the caller displays the alert.

Edit: NM - I moved it out of the class and into a VC. Probably better form anyway.