Зависание процесса, когда выполнено с Процессом.NET. Запустить — что случилось?

Мне удалось заставить его работать из подкласса NSWindowController

class MyWindowController: NSWindowController {

    override func keyDown(theEvent: NSEvent) {
        print("keyCode is \(theEvent.keyCode)")
    }
}

UPDATE:

import Cocoa

protocol WindowControllerDelegate {
    func keyDown(aEvent: NSEvent)
}

class WindowController: NSWindowController {

    var delegate: WindowControllerDelegate?

    override func windowDidLoad() {
        super.windowDidLoad()
        delegate = window?.contentViewController as! ViewController
    }
    override func keyDown(theEvent: NSEvent) {
        delegate?.keyDown(theEvent)
    }

}

и ViewController:

class ViewController: NSViewController, WindowControllerDelegate {

    @IBOutlet weak var textField: NSTextField!

    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override var representedObject: AnyObject? {
        didSet {
        // Update the view, if already loaded.
        }
    }
    override func keyDown(theEvent: NSEvent) {
        textField.stringValue = "key = " + (theEvent.charactersIgnoringModifiers
            ?? "")
        textField.stringValue += "\ncharacter = " + (theEvent.characters ?? "")
        textField.stringValue += "\nmodifier = " + theEvent.modifierFlags.rawValue.description
    }

}