How to cancelLocalNotification When app is in the background And I don't do anything

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Thank You in advance Xcode 7.3 ,oc Now I'm using the LocalNotification to make an alarm clock .I ran into a problem and consulted a lot of people who didn't get the answer .When I receive a LocalNotification, app is in the background, And I don't do anything ,Means I will not click on the LocalNotification or start app. how do I listen to the system received LocalNotification ?I would like to receive the LocalNotification for the next step.Or, how do I listen to the system started playing audio .In addition, how can I guarantee that even if the app is suspended in the background, I can listen to it. I can't think of a way out of it.

Can you help me ?

Thank You Thank You Thanks very much

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