41.8 The Handle Method
The handle method is where the activity associated with the intent is performed. Once the task is completed, a response is passed to Siri. The form of the response will depend on the type of activity performed. For example, a photo search activity will return a count of the number of matching photos, while a send message activity will indicate whether the message was sent successfully.
The handle method may also return a continueInApp response. This tells Siri that the remainder of the task is to be performed within the main app. On receiving this response, Siri will launch the app, passing in an NSUserActivity object. NSUserActivity is a class that enables the status of an app to be saved and restored. In iOS 10 and later, the NSUserActivity class has an additional property that allows an NSInteraction object to be stored along with the app state. Siri uses this interaction property to store the NSInteraction object for the session and passes it to the main...
