title: Image preloading in React Native
body: <p>I am building my first app with React Native, an app with a long list of images. I want to show a spinner instead of image while image is loading. It is sounds trivial but i didn't found a solution. 
  I think for a spinner i suppose to use <code>ActivityIndicatorIOS</code> , but how am i combining it with an <code>Image</code> component?</p>
  
  <pre><code>&lt;Image source={...}&gt;
    &lt;ActivityIndicatorIOS /&gt;
  &lt;/Image&gt;
  </code></pre>
  
  <p>Is this a right direction? Am i missing something?</p>