Create a Swift framework with submodules

Question

I have an Xcode project with a main app and a Swift Framework called Networking. Now I'd like to split that Networking module into a submodule with only some utility classes so that they are available to the main app only when explicitly imported. So the usage I'd like to achieve would be

import Networking
import Networking.Utils

// Public class in Networking
MyNetworking.doStuff()

// Public class in Networking.Utils
// Should not compile unless Networking.Utils is imported
MyNetworkingUtils.doSomething()

So my module has the following file structure

.
├── Core
│   ├── MyNetworking.swift
│   └── Networking.h
├── Info.plist
├── Utils
│   ├── NetworkingUtils.h
│   └── Utils.swift
└── module.modulemap

I created a custom module.modulemap with this content:

framework module Networking {
  umbrella header "Networking.h"

  export *
  module * { export * }

  explicit module Utils {
      header "NetworkingUtils.h"

  }
}

This creates the Networking module but the problem is that the Utils classes are available in the main Networking module.

The question is, how can I specify in the module map which Swift files (ideally subfolders) belong to which module.

The Networking has only Swift files so the umbrella .h files are basically empty.

Answer 1

It looks like it's good option here to have two different modules: Networking and NetworkingUtils (second could have dependency to first).