As of Xcode 16, there appears to be an irritating bug where Xcode keeps forgetting how to find the types from SwiftGodot, meaning you can’t build. I’ve found 2 workarounds:

  1. Use Clean Build Folder in Xcode and then rebuild.
    • This appears to work but I’m not sure how long it lasts, and I tend to need to redo this again and again.
  2. consider Using SwiftGodot with VS Code, which does not appear to have this bug.