NSUserNotificationCenter.default declared non-null but returns null

Number:rdar://43645642 Date Originated:23-Aug-2018 09:12 AM
Status:Open Resolved:
Product:macOS + SDK Product Version:10.13
Classification:Security Reproducible:Always
NSUserNotificationCenter.default is declared as a non-null property but returns null. Furthermore Swift seems happy with it and doesn’t throw any errors.

Steps to Reproduce:
Run this swift script (attached)


import Foundation 

let notification = NSUserNotification()
notification.title = "Wow"
let center = NSUserNotificationCenter.default

Expected Results:
I would expect NSUserNotificationCenter.default to throw an exception because I would argue that it is programmer error to be trying to get a UserNotificationCenter for a script/app/whatever that doesn’t have a bundle ID. (It appears that having a bundle ID is a prerequisite to being able to send notifications).

The fact that it returns null breaks the nullability contract on NSUserNotificationCenter.default.

Furthermore I would expect the swift side of things to error when I attempted to use the returned “center”.

Actual Results:
Center gets returned NULL.
center.deliver does not crash and there is no indication that anything failed.




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