I have a Safari App Extension that injects a button over images into a specific website and when tapping that button I want to trigger a function with some parameters in the application that contains the safari app extension ( NOT from .js to extension handler)
How can I communicate from the Safari App Extension with the main app in real time? NSUserDefaults
trough app groups does not seems a good idea
If you don't (can't) listen to updates of "shared user defaults" (using a group SuiteName). Then you may try with Distributed Notifications: https://developer.apple.com/documentation/foundation/distributednotificationcenter
It's quite simple and similar to messaging between Content Scripts and Safari App Extension.
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