After reading on Apple documentation and checking on stackoverflow, I could not completely understand if it is possible or not to invoke programmatically an specific app extension of type "Action" or "Share".
Mainly, I have built an app extension of type "Action" and I'd like to invoke it programmatically from a second app (so I can send some input attributes and get the output from the extension) without having to open the UIActivityViewController.
Is there any way to do it?
Not exactly. The way to invoke other action in other app is to use custom URL Scheme as mentioned in the Apple docs - https://developer.apple.com/library/archive/documentation/iPhone/Conceptual/iPhoneOSProgrammingGuide/Inter-AppCommunication/Inter-AppCommunication.html#//apple_ref/doc/uid/TP40007072-CH6-SW8
You can than pass some arguments as mentioned in the docs, and in your other app you'll need to parse the URL and act according to those parameters.