When app extensions don't launch
I had a difficult bug to root out regarding app extensions (related to my previous post). Â One of my apps could launch the notification service and content extensions without fail, whereas another would only show old-style iOS 9 notifications.
Looking at the device log I noticed when a notification arrived, iOS could not find an appropriate extension to launch, despite the "mutable-content" entry being set properly in the payload.
SpringBoard(UserNotificationsServer)[57] <Info>: Received incoming message on topic se.mydomain.myapp pkd(MobileCoreServices)[88] <Notice>: No plugins found to match query <private> pkd[88] <Info>: match returned 0 plug-ins
Investigating my successful case, I observed that the .app container housed a plugins folder which included two .appex binaries (for the service and content notifications). Â In my app which wasn't working, however, the same extensions had the file extension .app (as opposed to .appex).Â
Checking the Packaging series of Build Settings in Xcode for the extensions, I noticed a .xcconfig file was overriding the filename for the extensions, and accordingly causing iOS to not find any .appex that could service the notification. Â Correcting this build setting fixed the problem and notifications were thereafter parsed properly.