I'm not sure, but I'll bet there's a ton of blogs and wisdom on it, these days. Most of the new stuff seems to use SwiftUI, but UIKit has been around since the

I'm not sure, but I'll bet there's a ton of blogs and wisdom on it, these days. Most of the new stuff seems to use SwiftUI, but UIKit has been around since they first opened the SDK, and AppKit has been around longer than that. Apple likes to pretend everyone uses SwiftUI, but I'll lay odds that most AAA apps are ObjC-based.