I personally use Cocoapods for dependency management in all of my iOS apps and games. It's a bit like RubyGems if you've done any Ruby development. Instead of just dropping third-party libraries into your Xcode project, you can use Cocoapods to manage these third party libraries. Cocoapods is an excellent tool for managing and recording which third party libraries your game uses, and it has command line tools for downloading and updating thousands of third party libraries. If you're not using Cocoapods, you should be.
Although I personally like Cocoapods, a new alternative for managing your project dependencies is Carthage. If you contrast Cocoapods with Carthage, Cocoapods is probably the easier and more complete solution, while Carthage is more flexible and less intrusive to your project file. If you like getting "close to the metal" for your dependency management or the centralized nature of Cocoapods irks you, Carthage may be just the alternative you're looking for.