I work in a small company where I already did the design for an app using Material Design guidelines but now I have to design the iOS version; maybe I got used to Material guidelines but I can't find the equivalent of that for iOS, so far I have this massive official website (https://developer.apple.com/ios/human-interface-guidelines/) where they explain the "why" of everything and I'm reading it... still... no specs at all.
Do I have to download Sketch (maybe it has its own iOS library) or how do I get the measures?
Im guessing that the answer is going to be very obvious.