text: Q:
  
  Capture Global Keydown Events (not simply observe)
  
  I've created some global hotkeys. However using addGlobalMonitorForEventsMatchingMask I can only observe keydown events. What if I want to capture the event and prevent other applications from receiving it? 
  Here's what I have for observing keydown events:
      class AppDelegate: NSObject, NSApplicationDelegate {
          func applicationDidFinishLaunching(aNotification: NSNotification) {
              NSEvent.addGlobalMonitorForEventsMatchingMask(.KeyDownMask, handler: keyDown)
              NSEvent.addLocalMonitorForEventsMatchingMask(.KeyDownMask) { (event) -> NSEvent! in
                  self.keyDown(event)
                  return event
              }
          }
          func keyDown(event : NSEvent) {
              if event.modifierFlags.contains(.ControlKeyMask) && event.modifierFlags.contains(.AlternateKeyMask) && event.modifierFlags.contains(.CommandKeyMask) && event.keyCode == 126 {
                  print("⌃⌥⌘↑ pressed")
              }
          }
      }
  
  I'm not sure where to start to capture keydown events. Any help would be great. Thanks.
  
  A:
  
  DDHotKey allows you to capture keydown events and use them to trigger function in you app. I discovered it recently in this post. If you don't already know how to integrate Objective-C code into a Swift project, you can find the Apple documentation here.
  
  