Swift OSX key event

 override func keyDown(with event: NSEvent) {
    if (event.keyCode == 1){
        //do whatever when the s key is pressed
        print("S key pressed")
    }
}

Updated for SWIFT 3

SWIFT 4: I created a repo solving this problem on my games. I mainly use this with my MTKView but should work with NSViews too.

https://github.com/twohyjr/NSView-Keyboard-and-Mouse-Input

Here is some example code:

  override func keyDown(theEvent: NSEvent) {
            if (theEvent.keyCode == 1){
           //do whatever when the s key is pressed
        } 

    }

Key codes: