+1 for using the Apple docs. They are the best way I've found to get a real understanding of how a framework is used and the functionality it provides. The Xcode builtin docs are really great as well and save a ton of time when you just need a quick method definition or signature.
I'm in the CocoaPods camp myself. It's what I used when building open source frameworks, mainly because I started using it before Swift and Carthage came around and I'm waiting for Swift Package Manager to become more stable before I switch over.
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