Xcode includes a release of Swift that is supported by Apple. You can try out a version that is still in development by downloading one of the packages from download page.

1. Download a latest Swift release (6.0.3) or development snapshot package. Make sure that your system meets the aforecited requirements for this package.

2. Run the package installer, which will install an Xcode toolchain into /Library/Developer/Toolchains/.

   An Xcode toolchain (.xctoolchain) includes a copy of the compiler, LLDB, and other related tools needed to provide a cohesive development experience for working in a specific version of Swift.

• To select the installed toolchain in Xcode, navigate to Xcode > Toolchains.

  Xcode uses the selected toolchain for building Swift code, debugging, and even code completion and syntax coloring. You’ll see a new toolchain indicator in Xcode’s toolbar when Xcode is using an installed toolchain. Select the default toolchain to go back to Xcode’s built-in tools.

• Selecting a toolchain in Xcode affects the IDE only. To use the installed toolchain with

  • xcrun, pass the --toolchain swift option. For example:

    xcrun --toolchain swift swift --version
    

  • xcodebuild, pass the -toolchain swift option.

  Alternatively, you may select the toolchain on the command line by exporting the TOOLCHAINS environment variable as follows:

  export TOOLCHAINS=$(plutil -extract CFBundleIdentifier raw /Library/Developer/Toolchains/<toolchain name>.xctoolchain/Info.plist)
  

Code Signing on macOS

The macOS .pkg files are digitally signed by the developer ID of the Swift open source project to allow verification that they have not been tampered with. All binaries in the package are signed as well.

The Swift toolchain installer on macOS should display a lock icon on the right side of the title bar. Clicking the lock brings up detailed information about the signature. The signature should be produced by Developer ID Installer: Swift Open Source (V9AUD2URP3).