I have an `UIImageView` that displays an user's Facebook photo. I download the image with `AFNetworking` and it is caching the image while the app is open. 

What I want to know is if there is any built-in method that would allow me to keep the image saved on the device and use it in further sessions if there is no Internet. I know I can download the image and save it to the device manually, but I was wondering if there is already something built-in for that.