Using SMJobBless and friends is rather… painful. SMJobKit does everything in its power to alleviate that and get you back to writing awesome macOS apps.
SMJobKit is more than just a framework/library to link against. It gives you:
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A Xcode target template for SMJobBless-ready launchd services, completely configured for proper code signing!
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A client abstraction that manages installing/upgrading your app's service(s).
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A service library that pulls in as little additional code as possible. Less surface area for security vulnerabilities!
To get started, pull the SMJobKit project into your own project or workspace. Have your application
depend on the SMJobKit framework, and hit build. In addition to building the framework, this also
causes the Xcode template to install its self into ~/Library/Developer/Xcode/Templates.
Next, you should set up your service helper/target: Add a new SMJobKit Service target to the project. This is relatively configuration-heavy, so you should probably build it right away to make sure everything is properly configured (and your code signing certificates are in order). You may want to review the template's documentation for an in-depth explanation of what it is doing for you.
Finally, you need to add a Copy Files build phase to your application target. The destination
should be "Wrapper" with a subpath of Contents/Library/LaunchServices. Add the service's built
product to the list. Make sure you add a dependency on your service target!
And, hopefully, that's all you need to do in order to configure your project!
You'll want to create a subclass of Client in your application, and override
serviceIdentifier at the very least.