title: React-Native (FlatList): How to know when the rendering of visible items has finished
body: <p>When using a FlatList Component in react native I need to know when all the visible items have been rendered.</p>
  
  <p>I am providing <code>data</code> and the <code>renderItem</code> when I get the <code>componentDidMount</code> I can see the FlatList there but because FlatList Component asynchronously renders each item they only show up after on <code>componentDidUpdate</code>. Also, this could (and probably will) include off-view items.</p>
  
  <p>I would like to know if there is someone out there that has found a possible way to have a controlled process (not with <code>setTimeout</code>) of knowing when the visible items are fully rendered.</p>
  
  <p>Thanks.</p>