Opening a window for status bar OS X 10.10 application

Question

I'm developing a status bar OS X application with Swift 1.2 and storyboards.

My application doesn't have an initial controller because I don't want any windows to be displayed when the app is being launched. But, I need to open a preferences window if the app hasn't been configured. How do I do that properly? Now I'm doing that with NSPopover, but that's an ugly solution and doesn't provide a good UX.

Is there a way to open a window, a view controller, if an application doesn't have an entry point, an initial controller? I have a feeling that my architecture might be wrong. Thanks.

import Cocoa

let kPreferences = "preferences"

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var statusMenu: NSMenu!

    let popover = NSPopover()
    var statusItem = NSStatusBar.systemStatusBar().statusItemWithLength(-2)

    func applicationDidFinishLaunching(aNotification: NSNotification) {

        syncronizeExcercises()

        // Status menu icon
        let button = statusItem.button
        button!.image = NSImage(named: "statusIcon")

        statusItem.menu = statusMenu

        let defaults = NSUserDefaults.standardUserDefaults()
        if let prefences = defaults.stringForKey(kPreferences) {
            println(prefences)
        } else {
            let preferencesViewController = NSStoryboard(name: "Main", bundle: nil)?.instantiateControllerWithIdentifier("PreferencesViewController") as! PreferencesViewController
            preferencesViewController.notConfigured = true

            popover.contentViewController = preferencesViewController
            popover.showRelativeToRect(button!.bounds, ofView: button!, preferredEdge: NSMinYEdge)
        }
    }

Answer 1

Okay, I ended up creating an initial view controller and now showing the main window in case the app is configured.

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

    @IBOutlet weak var statusMenu: NSMenu!

    var window: NSWindow?
    let popover = NSPopover()
    var statusItem = NSStatusBar.systemStatusBar().statusItemWithLength(-2)

    func applicationDidFinishLaunching(aNotification: NSNotification) {
        window = NSApplication.sharedApplication().windows.last! as? NSWindow
        window!.close()

        syncronizeExcercises()

        // Status menu icon
        let button = statusItem.button
        button!.image = NSImage(named: "statusIcon")

        statusItem.menu = statusMenu

        let defaults = NSUserDefaults.standardUserDefaults()
        if let prefences = defaults.stringForKey(kPreferences) {
            println(prefences)
        } else {
            let preferencesViewController = window?.contentViewController as! PreferencesViewController
            preferencesViewController.notConfigured = true

            window?.makeKeyAndOrderFront(nil)
        }
    }