title: Cocoa Listen to Keyboard command+up Event
body: <p>I am working on a macOS app and I would like to handle a local hotkey event (command + up arrow key) in a <code>NSViewController</code>.</p>
  
  <p>Here's how I do it with Swift:</p>
  
  <pre><code>override func keyDown(with event: NSEvent) {
  
      let modifierkeys = event.modifierFlags.intersection(.deviceIndependentFlagsMask);
      let hasCommand = modifierkeys == .command;
  
      switch Int(event.keyCode) {
      case kVK_UpArrow where hasCommand:
          print("command up");
          break;
      case kVK_ANSI_B where hasCommand:
          print("command B");
          break;
      default:
          break;
      }
  }
  </code></pre>
  
  <p>When I build and press command+up in the view, the console shows nothing. But when I press command+B, "command B" is logged out.</p>
  
  <p>So why isn't this working for Command+up? How should I achieve this?</p>