API рекламы продуктов Amazon: получить средний рейтинг клиентов

Вот как вам нужно сделать, чтобы программно показать вашу Windows:

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {

     let mainWindow = NSWindow(contentRect: NSMakeRect(0, 0, NSScreen.mainScreen()!.frame.width/2, NSScreen.mainScreen()!.frame.height/2), styleMask: NSTitledWindowMask|NSResizableWindowMask|NSMiniaturizableWindowMask|NSClosableWindowMask, backing: NSBackingStoreType.Buffered, defer: false)

    func createNewWindow(){
        mainWindow.title = "Main Window"
        mainWindow.opaque = false
        mainWindow.center()
        mainWindow.hidesOnDeactivate = true
        mainWindow.movableByWindowBackground = true
        mainWindow.backgroundColor = NSColor(calibratedHue: 0, saturation: 0, brightness: 1, alpha: 1)
        mainWindow.makeKeyAndOrderFront(nil)
    }
    func applicationDidFinishLaunching(aNotification: NSNotification) {
        // lets get rid of the main window just closing it as soon as the app launches
        NSApplication.sharedApplication().windows.first!.close()
    }
    func applicationWillTerminate(aNotification: NSNotification) {
        // Insert code here to tear down your application
    }
    @IBAction func menuClick(sender: AnyObject) {
        createNewWindow()
    }
}

или вы можете создать дополнительный NSWindow var для хранения своего окна, прежде чем закрыть его, как следует

import Cocoa

@NSApplicationMain
class AppDelegate: NSObject, NSApplicationDelegate {
    var defaultWindow:NSWindow?
    func applicationDidFinishLaunching(aNotification: NSNotification) {
        // lets get rid of the main window just closing it as soon as the app launches
        defaultWindow = NSApplication.sharedApplication().windows.first as? NSWindow
        if let defaultWindow = defaultWindow {
            defaultWindow.close()
        }
    }
    func applicationWillTerminate(aNotification: NSNotification) {
        // Insert code here to tear down your application
    }
    @IBAction func menuClick(sender: AnyObject) {
        if let defaultWindow = defaultWindow {
            defaultWindow.makeKeyAndOrderFront(nil)
        }
    }
}