NSNotification breaking in Swift when trying to pass back userInfo

Question

I'm having issues trying to pass back userInfo via postNotification in Swift. What's strange is the code only breaks when I try to use userInfo -- if I post a notification with no data to a selector with no parameters, everything works. But when I try to pass back userInfo, I get a "unrecognized selector sent to instance" error. So something's wrong with my selector signature in my ViewController, but I can't figure out what.

Here is the code that breaks:

In my table view

let data = ["selection": selectedOption]
dismissViewControllerAnimated(true, completion: {NSNotificationCenter.defaultCenter().postNotificationName(wordsetPickedNotification, object: self, userInfo: data)})

In my view controller:

NSNotificationCenter.defaultCenter().addObserver(self, selector: "wordsetPicked", name: wordsetPickedNotification, object: nil)
...
func wordsetPicked(n:NSNotification) {
    //do stuff
}

Answer 1

Change selector: "wordsetPicked" to selector: "wordsetPicked:".