I'm developing a game for iOS and I need to make a system to download "packs" after the player bought them with In App Purchases.
I've search on the internet for a method like using a bundle, or just using web services, but I really don't know which one is the best.
Let me be specific: in one pack the player has between 1-3 sprites, 1-2 music files, and 1-3 backgrounds.
So what I need to do is download that "pack" and store it as "purchased". What methods would be the most reusable and modular?
By far the easiest and most simple solution would be to bundle the DLC in to your app with an update and simply use an in app purchase to unlock them for the user. This saves their time and bandwidth as they no longer have to download the files and it saves you paying for a server to host it all.
There are several ways to go about this. In the past I created a system for a previous client that used a manifest that referenced all the files in the "pack", then downloaded each asset. The manifest could be updated to point to updated/different assets if needed, and contained a version number so that the system would know if it needed to update assets after the user had previously downloaded the pack. I probably wouldn't worry so much with a one-size-fits-all approach on this; just get something up and running for this one project that can be used on all DLC packs. Your next project will probably need heavy modifications for the same system to work.
来源：https://stackoverflow.com/questions/11433470/need-to-make-a-dlc-packet-system-for-my-ios-game