I have an AppleWatch app that receives remote notifications. I want the user to be able to open the watch app from a custom notification action and view the item the notification is about. But debugging my Notification scene in my watch app never actually delivers the notification content to my root WKInterfaceController, and just keeps spitting out errors like this in the console:
[default] -[SPRemoteInterface _interfaceControllerID:]:2402: ComF: interfaceControllerID for controller:(null) not found (clientIdentifier=(null))
[default] -[SPRemoteInterface _interfaceControllerClientIDForControllerID:]:2414: ComF: clientIdentifier for interfaceControllerID:(null) not found
[default] -[SPRemoteInterface didFinishHandlingActivity:]:2292: ComF:<-Plugin controller ID (null) (object:(null)) has no client identifier
Whether I use a custom notification UI or not (WKUserNotificationInterfaceTypeCustom vs Default), tapping a button or the notification itself doesn't pass any information through to my root interface controller.
I've implemented handleActionWithIdentifier:forNotification: in my root WKInterfaceController, but it never gets called. My extension delegate does not implement handleActionWithIdentifier:forNotification:withResponseInfo:.
I've tried setting my WKExtensionDelegate implementation to the delegate of the UNUserNotificationCenter and implementing userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:, and that gets called, but I can't seem to get to my root interface controller to have it handle the content. I get the errors above.
Notably, things seem to work once in a while when I make code changes and build and run. But if I rerun the same code it never works - I always get the error messages above.
How is this supposed to work? It must be possible - every messenger app in the world with a watch app does this. But I can't find a tutorial or code example anywhere about how to get notification payload reliably into a WKInterfaceController subclass.
Update: Interestingly, if I set up my extension delegate as the UNUserNotificationCenter's delegate and handle userNotificationCenter:didReceiveNotificationResponse:withCompletionHandler:, it works sometimes, but other times I get the error messages listed above, and when I try to get [WKExtension sharedExtension].rootInterfaceController, it's nil.