title: React native onKeyPress is not working?
body: <p>I have just placed TextInput <code>KeyboardType ={"numeric"}</code> just trying to find weather user enter '-' if means I have to <code>event.preventDefault()</code> in OnChange first.Later tried in onKeyPress but onKeyPress is not trigerring , I was just tried to do that but it allowing me to type shows warning Synthetic Event Performance issue.</p>
  
  <p>guys help me .</p>