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by cjk 1226 days ago
I can't vouch for any of the more recent versions of CS193P, but the original incarnation on iTunes U in ~2008 was my introduction to Objective-C and C, and I found it invaluable. I remember Loren Brichter's guest lecture on the development of Tweetie being really insightful.

Personally, I'd skip Swift / SwiftUI until you have a decent understanding of the Objective-C frameworks underpinning the vast majority of the macOS/iOS SDKs.