[Books by Objc.io](https://www.objc.io/books/ https://www.objc.io/books/) are great. Also whilst not a book, [Composable Architecture](https://github.com/pointf

[Books by Objc.io](https://www.objc.io/books/ https://www.objc.io/books/) are great. Also whilst not a book, [Composable Architecture](https://github.com/pointfreeco/swift-composable-architecture https://github.com/pointfreeco/swift-composable-architecture) seems like a nice way to develop cross platform (iOS/macOS) apps.