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I added an XPC Service to my project and I would like to set breakpoints and inspect variable contents in the debug area in XCode. Breakpoints that I set in the service's code are not recognized (obviously, the debugger is attached to the main apps process. How and I attach the debugger (manually or automatically) to the XPC Service process after my main app launches it? Is there some way to run the service alone and send it messages without it being launched from the main app?
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macOS uses XPC services for basic inter-process communication between various processes, such as between the XPC Service daemon and third-party application privileged helper tools.
The XPC Services API provides a lightweight mechanism for basic interprocess communication at the libSystem level. It allows you to create lightweight helper tools, called XPC services, that perform work on behalf of your app.
Cross Process Communication (XPC) is a lightweight mechanism for interprocess communication integrated with Grand Central Dispatch (GCD) and launchd. XPC is designed as a native bidirectional way to exchange data. It follows a classic approach of data exchange over connection.
Debug -> Attach To Process -> By Process Identifier (PID) or Name...
Type in your XPC service process name. The next time launchd starts up your XPC service, Xcode will attach.
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I am actually not sure how to attach the debugger. But you can still use "NSLog" for debug output on the console. Then start the "Console.app" in "/Applications/Utilities/Concole.app". Depending on your system language this app may have a different name (it's localized). It shows ALL NSLog outputs from all Applications which are running including your xpc-services.
It's not the debugger, but you will get informations out of your service.
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