title: How to store a set of images permanently in iOS app - Swift
body: <p>I'm trying to make a manga reader app. I already have a manga reader site with all database and asset (PHP - MySQL). I really need an advise how to allow my iOS app user store the manga they want in their phone for offline use. My app doesn't allow user post anything. They just receive data.</p>
  
  <p>Actually I have download some manga reader app but I don't understand how they provide those functions above.</p>
  
  <p>Do they use Cloudkit or Parse? Or they just use JSON to get image links and save the image into Core Data.
  Thank you</p>