title: How to get the position of the currently focussed input?
body: <p>I need to know the position of the currently focussed input to make some calculations. At the end I want to call <code>.measure()</code> on it.</p>
  
  <p>What I got:</p>
  
  <pre><code>import { TextInput } from 'react-native';
  
  const { State: TextInputState } = TextInput;
  var currentlyFocussedField      = TextInputState.currentlyFocusedField();
  
  console.log('currentlyFocussedField', currentlyFocussedField);
  </code></pre>
  
  <p>But this only returns the id of the text field (like <code>394</code>, and the next field is <code>395</code>). How can I access the real element/object or how do I get its position on the screen?</p>