title: how to check for backspace(delete) keyPress in react native (iOS)
body: <p>I want to fire a function when the user hit backspace in a textbox. I have searched on stack overflow and React Native docs but there is not a relevant answer.
  basically, I don't know whats the keyname for backspace</p>
  
  <pre><code>      &lt;TextInput
            onChangeText = {e =&gt; {
            e === 'BackSpace' ? alert('delete') : alert(e)
         }}/&gt;
  </code></pre>