Swift for Visual Studio Code
This extension adds language support for Swift to Visual Studio Code. It supports:
- Code completion
- Jump to definition, peek definition, find all references, symbol search
- Error annotations and apply suggestions from errors
- Automatic generation of launch configurations for debugging with CodeLLDB
- Automatic task creation
- Package dependency view
- Test Explorer view
Swift support uses SourceKit LSP for the language server to power code completion and LLDB to enable debugging.
The extension is developed by members of the Swift Community and maintained by the SSWG. The aim is to provide a first-class, feature complete extension to make developing Swift applications on all platforms a seamless experience.
If you experience any issues or want to propose new features please create an issue or post on the #vscode-swift channel on Slack.
Contributing
The Swift for Visual Studio Code extension is a community driven project, developed by the amazing Swift community. Any kind of contribution is appreciated, including code, tests and documentation. For more details see CONTRIBUTING.md.
Installation
For the extension to work, you must have Swift installed on your system. Please see the Getting Started Guide on Swift.org for details on how to install Swift on your system. Install the extension from VSCode Marketplace and open a Swift package! You'll be prompted to install and configure the CodeLLDB extension, which you should do so.
Features
Language features
The extension provides language features such as code completion and jump to definition via the Apple project SourceKit-LSP. For these to work fully it is required that the project has been built at least once. Every time you add a new dependency to your project you should build it so SourceKit-LSP can extract the symbol data for that dependency.
Automatic task creation
For workspaces that contain a Package.swift file, this extension will create the following tasks:
- Build All: Build all targets in the Package
- Build Debug : Each executable in a Package.swift get a task for building a debug build
- Build Release : Each executable in a Package.swift get a task for building a release build
These tasks are available via Terminal ▸ Run Task... and Terminal ▸ Run Build Task....
Commands
The extension adds commands, available via the command palette.
- Resolve Package Dependencies: Run
swift package resolveon package associated with open file. - Update Package Dependencies: Run
swift package updateon package associated with open file. - Reset Package Dependencies: Run
swift package reseton package associated with open file. - Open Package.swift: Open Package.swift for package associated with open file.
- Clean Build: Run
swift package cleanon package associated with open file. - Run Swift Script: Run the currently open file, as a Swift script. If the file has not been saved it will save it to a temporary file so it can be run.
- Run Swift Snippet: If the currently open file is a Swift snippet then run it.
- Debug Swift Snippet: If the currently open file is a Swift snippet then debug it.
- Run Command Plugin: Display menu of command plugins for currently loaded packages.
The following command is only available on macOS
- Select Xcode Developer Dir: Select the version of Xcode you want to use swift tools from.
- Select Target Platform: This is an experimental command used to get code completion for iOS, tvOS projects
Package dependencies
If your workspace contains a package that has dependencies, this extension will add a Package Dependencies view to the Explorer:
Additionally, the extension will monitor Package.swift and Package.resolved for changes, resolve any changes to the dependencies, and update the view as needed.
Debugging
The Swift extension uses the CodeLLDB extension for debugging.
When you open a Swift package (a directory containing a Package.swift) the extension creates build tasks and launch configurations for each executable. If the package contains tests, the extension creates a configuration to run the tests. These all use the CodeLLDB extension as a debugger.
Press F5 to run an executable and start debugging. If you have multiple launch configurations you can choose which launch configuration to use in the debugger view.
CodeLLDB has a version of lldb packaged with it and by default this is the version it uses for debugging. However, this version of lldb does not work with Swift. Fortunately, CodeLLDB allows you to choose an alternate version. The Swift extension will attempt to ascertain which version is required and give you the option to update the CodeLLDB configuration.
Test Explorer
If your package contains tests then they can be viewed, run and debugged in the Test Explorer.
Once your project has been built the Test Explorer will be able to list all your tests. These are grouped by package, then test target and finally XCTestCase class. From the Test Explorer you can initiate a test run, debug a test run and if a file has already been opened you can jump to the source for a test.