title: Does the UIImage Cache image?
body: <pre><code>UIImage *img = [[UIImage alloc] initWithContentsOfFile:@"xx.jpg"]
  UIImage *img = [UIImage imageNamed:@"xx.jpg"]
  </code></pre>
  
  <p>In the second type will the image get cached ?<br>
  Whereas the in the first type the images doesn't get cached?</p>