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This Xcode projects demonstrates simple XPC communication between an application and an XPC service.

The project includes:

• A main application with a user interface,
• An XPC service embedded within the main application

To use this application:

• Build and Run the XPCApp target
• Use the Start Timer button to launch a timer on the XPC service which will trigger the client's count variable to be incremented on firing
• Use the Cancel Timer button to cancel the XPC service's timer
• Use the Invalidate Connection button to invalidate the main application's XPC connection, to demonstrate the on demand re-creation of the XPC connection

The XPC Service is launched automatically alongside the main application, and terminates when the main application terminates.

Please refer to Apple's Daemons and Services Programming Guide for a more in-depth discussion of this topic.