title: React Native - Image Cache
body: <p>I read the document about the React Native image component in this site and got some questions: <a href="https://facebook.github.io/react-native/docs/image.html" rel="noreferrer">https://facebook.github.io/react-native/docs/image.html</a></p>
  
  <ol>
  <li><p>If I use the source property to display image. Will the image be cached and save to disk after download?</p></li>
  <li><p>If yes, what is the cache policy?</p></li>
  <li><p>If I want to save the downloaded image to disk. Is it better to use getSize or prefetch method to do it?</p></li>
  </ol>
  
  <p>Many thanks.</p>