title: How do you detect key up / key down events from a hardware keyboard on iOS?
body: <p>While there are many methods posted on SO regarding hacking keyboards to work, for example, <a href="https://stackoverflow.com/questions/19235762/how-can-i-support-the-up-and-down-arrow-keys-with-a-bluetooth-keyboard-under-ios">How can I support the up and down arrow keys with a Bluetooth keyboard under iOS 7</a>, or <a href="https://stackoverflow.com/questions/1267560/receive-iphone-keyboard-events/8862814#8862814">Receive iPhone keyboard events</a>, none of them are documented.</p>
  
  <p>Is it possible to detect a keyUp: / keyDown: input event from a hardware keyboard (e.g. bluetooth) in iOS using public APIs?</p>