Starting with 5.3 version of Swift, we can bundle our resources within the Swift package. Following that, I included an xcassets catalog with my colors in a helper UI Swift Local Package. When running in Dark Mode and applying the colors via IB Storyboard, it always shows the one for Any Appearance instead of the one set for Dark Appearance, even if both are discoverable and visible from IB. I am using // swift-tools-version:5.3 and Xcode Version 12.3 (12C33). There is a fix for this issue?