Demo of using a class to find the class name (minus module prefix)

gistfile1.swift

import Cocoa

extension NSObject {
    class func classNameNoModule() -> String {
        let names = self.className().componentsSeparatedByString(".")
        if let lastName = names.last {
            return lastName
        } else {
            return self.className()
        }
    }
}

class MainWindowController: NSWindowController {

    @IBOutlet weak var textField: NSTextField!
    
    // MARK: NSWindowController
    
    override var windowNibName: String? {
        return MainWindowController.classNameNoModule()
    }
    
    // MARK: Actions
    
    @IBAction func generatePassword(sender: AnyObject) {
        let length = 8
        let password = generateRandomString(length)
        textField.stringValue = password
    }
    
}

Hi,
why not just use.

 self.className.componentsSeparatedByString(".").last 

in the place where you call your method/function.

My thinking at the time (even though it's not evident in the code) was trying to work out a solution for things that didn't subclass from NSObject but you are right, if you live with that assumption the one liner works fine.