SCNViewController is a Swift micro-library that provides a configurable/reusable SCNViewController class— a UIViewController subclass with a SceneKit SCNView.
The master branch is Swift ≥5.5, and build overlays (the minimal changeset to the Package.swift, xcodeproj, and other build files) of the current library version are available on the swift-5.0, swift-4.2, swift-4, and swift-3 branches. (Note: I don't check these builds as often as I used to when Swift 4.2 or 4.0 were the latest versions, but their changes haved worked and I've merged new library versions into them since then.)