What is the process for compiling solely the iOS App Extension?

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Open Xcode and open the project that contains the iOS App Extension target.

Select the iOS App Extension target from the list of targets in the project navigator.

Set the build scheme to the iOS App Extension target.

Clean the project by selecting Product > Clean from the Xcode menu.

Build the iOS App Extension by selecting Product > Build from the Xcode menu.

Check the build logs for any errors or warnings.

If the build succeeded, the iOS App Extension binary should be located in the project's build directory.

The iOS App Extension can now be distributed or installed on a device using Xcode or other tools.