How to take back local notification after being displayed?

Question

Set the scene: Its 7:55 AM. Sets local notification for 8:01 AM. Pops up on lock screen at 8:01 AM. User ignores it.

Would it be possible to take back that notification at lets say 8:07?

In Knock, the app that lets you unlock your macbook with a nock does this. It shows “knock twice to unlock on the lock screen. When you knock, it disappears. How is this done?

Answer 1

Yes. You call -cancelLocationNotification on UIApplication passing to it the local notification instance you want to cancel.

Check the docs:

https://developer.apple.com/library/ios/documentation/NetworkingInternet/Conceptual/RemoteNotificationsPG/Chapters/IPhoneOSClientImp.html

... and

https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIApplication_Class/Reference/Reference.html#//apple_ref/occ/instm/UIApplication/cancelLocalNotification:

Also see:

Can I dismiss the local notification when next time the app launch?

Dismiss local notifications when application becomes active