Hi, I noticed in this page, there is no explanation about who/when/how the method handle_checkbox_toggle is called.
Ultimately, how should the app come to know when a app service is allowed or disallowed in System Settings > Login Items ?
Service Management how to register handle_checkbox_toggle?
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I think you’ve misunderstood the nature of that method. In the page you referenced, handle_checkbox_toggle(_:) shows how your app would respond to the user clicking a checkbox within your app to enable the login item. It’s not meant to show anything to do with the user clicking things in System Settings.
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I also made the same mistake, thinking there was a way to be notified when settings were changed. Thing is, I've seen other apps do this. As soon as I enable a startup item, for instance, the app reacts and closes a priming window, or allows full functionality, etc.
The original question of "how should the app come to know when a app service is allowed or disallowed in System Settings > Login Items ?" is still unanswered here.