title: Caching images -- NSURLRequest and cachePolicy Vs Custom code
body: <p>I have several UITableViews that asynchronously load the images, and text from the internet. I want to cache images to speed up performance.</p>
  
  <p>What would be best:</p>
  
  <pre><code>* Using NSURLRequest and cachePolicy?
  * Saving the image to file system?
  </code></pre>
  
  <p>For NSURLRequest and cachePolicy case, how would I clean the images if I do not want to use them.</p>