objc.io is a German publisher founded by Florian Kugler, Daniel Eggert, and Chris Eidhof — focused entirely on advanced Apple-platform development. The objc.io catalog includes deeply respected Swift / iOS books (Functional Swift, Advanced Swift, Thinking in SwiftUI, Core Data) and a series of paid screencasts that go deeper than typical iOS tutorial material.
The CourseFlix listing carries Thinking in SwiftUI from objc.io. Material is paid and aimed at iOS developers ready to think about SwiftUI as a declarative system rather than a UIKit replacement.
