sdk - UIEvent for iPhone locking & unlocking? -

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I am creating an iPhone app in which I want time user activity. However, while calculating the time the iPhone was locked (or when the user received a phone call) I did not want to calculate that time what is the best way to do it? Is there a UIEvent on which my app can get the iPhone lock or unlock (and can work on)?

find methods applications: and applicationDidBecomeActive: .


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