title: How to associate an "onPress" event with the Button, TouchableOpacity, etc that generated it?
body: <p>In my React Native project using NativeBase I'd like to generate a series of <code>Buttons</code> or <code>TouchableOpacities</code>.</p>
  
  <p>That means I don't want each to have a separate <code>onPress</code> handler but one shared one.</p>
  
  <p>But when I look at what is passed to the <code>onPress</code> callback there doesn't seem to be any kind of ID or reference to the component that caused the press, nor can I find such a thing documented.</p>
  
  <p>Am I missing something obvious? Is there another method everybody uses to achieve the same goal? Or is this actually missing functionality?</p>