UIAlertView raised from background

I'm developing an Alarm App.

When the alarm starts sounding I pop up an UIAlertView in order to offer the user the option to stop it. But when the app is in background开发者_高级运维 the UIAlertView doesn't appears.

How can I do a UIAlert similar to the alert that uses the iOS Alarm?

Thanks!!

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You could start reading about this: Apple documentation about notifications. You are probably most likely interested in local notification.