title: AFNetworking vs SDWebimage
body: <p>I am developing a news app. Get the image and news from the server. I want to use cache to get the old news. And the custom can remove the cache when there is less disk storage. </p>
  
  <p>The NSURLSession seems have bug for cache. So I decided to use AFNetworking or SDWebImage. But I don't know which one is suit for my app.</p>