[](#) [](http://twitter.com/MarcoEidinger) # SwiftPlantUML.app Generate and view a class diagram for Swift code in Xcode or from the Finder. Use the hosting macOS application to configure the diagram visualization. The Source Editor Extension (as well as the Action extension) makes use of [`SwiftPlantUML`](https://github.com/MarcoEidinger/SwiftPlantUML) Swift package. To generate a large diagram from a project with Swift files across folders then I recommend using `SwiftPlantUML` as a command-line tool. ## Features ### Xcode - [X] 📊 Create class diagram from Swift file - [X] 🔦 Create class diagram from selected Swift code  ### Finder - [X] 📊 Create class diagram from selected Swift file(s) https://user-images.githubusercontent.com/4176826/218329052-b03ec650-d845-46a2-a31b-6d3817add52a.mp4 ## Example  ## Install Homebrew ```bash brew install swiftplantumlapp ``` *Alternative* - Download latest *SwiftPlantUML* package from the [Releases](https://github.com/MarcoEidinger/SwiftPlantUML-Xcode-Extension/releases). - Copy *SwiftPlantUML* to your *Applications* folder. ## Enable Extension - Launch *SwiftPlantUML*. - To use in **Xcode**: enable extension in System Preferences > Extensions > Xcode Source Editor > select SwiftPlantUML  - To use in **Finder**: enable extension in System Preferences > Extensions > Finder > select Open Swift Class Diagram  ## Configure *Optional*: ## Troubleshooting ### The command "Open editable diagram in browser" is still busy Xcode Source Code Extension initialization might take up ~ 30 seconds on initial launch. If the prompt does not appear within 60 seconds  then check for a crash report related to XPC service in Console app of your MacOS. If you see such crash report related to `fatal error: Loading sourcekitd.framework/Versions/A/sourcekitd failed` please check the installation path of Xcode. If it's installed under `/Applications/Xcode.app`, please run: ``` sudo xcode-select -s /Applications/Xcode.app/Contents/Developer ``` If it's installed elsewhere, please replace the `/Applications/Xcode.app` path in the command above with the location where you've installed Xcode. ## Technical Details This Source Editor Extension makes use of XPC service to run the app sandboxed and use `SwiftPlantUML` (and its dependency `SourceKitten`). Source Editor Extensions using `SourceKitten` (either directly or indirectly) have to either run in a non-sandboxed app (and could not be distributed via the App Store) or use XPC service to outsource the use of `SourceKitten` to a different process. # Acknowledgements These awesome blog posts helped me to dive into Xcode Source Editor Extensions and XPC services - https://www.vadimbulavin.com/xcode-source-editor-extension-tutorial/ - https://nshipster.com/xcode-source-extensions/ - https://ilya.puchka.me/xcode-source-editor-extension-superpowered-with-sourcekitten/ - https://www.objc.io/issues/14-mac/xpc/