title: React native "prefetch" data?
body: <p>Is there a way to have the data already loaded before displaying it in a list? We have a FlatList which loads all the countries by doing a fetch in the componentWillMount() but this takes a split second to load and render the list. Is there a way to already have this data loaded so when this list is displayed (it's currently in a nested stack navigator) the list of countries are already there? We did consider loading it in the root screen and passing the state down as a prop with the data but it doesn't feel "right" way.</p>
  
  <p>I have a feeling this is something Redux would be useful for but we don't currently use it.</p>
  
  <p>Thanks all!</p>