@Fabian Thanks for the tip! I was going to start with SwiftUI, but after reading this, UIKIt is the way to go. It seems SwiftUI is a kind of "declarative" format, and UIKit is a more traditional widget response like touch, etc. In my C++ iOS, I used QML, which is a declarative language that interacts with Qt's C++, but that is geared for small devices like microcontrollers and automative. https://getstream.io/blog/uikit-vs-swiftui/