title: Preloading images in a Modal-component
body: <p>I have a component which consists of a FlatList and a Modal-component. This modal component has several Image-components. The images are set by the <em>source</em>-attribute to an external url.</p>
  
  <p>I switch die visibility of the modal-component by changing the <em>visible</em> attribute.</p>
  
  <p>The problem:
  Everytime I open the modal (at the beginning or after closing it) the images are loaded from the server. So there are no images for maybe 1 second.
  Are the images deleted from the cache if I set the visible of the modal to false??</p>