Global Variable

UIApplicationDidBecomeActiveNotification

Posted when the app becomes active.

Declaration

const NSNotificationName UIApplicationDidBecomeActiveNotification;

Discussion

An app is active when it is receiving events. An active app can be said to have focus. It gains focus after being launched, loses focus when an overlay window pops up or when the device is locked, and gains focus when the device is unlocked.

See Also

Responding to App Life-Cycle Events

- applicationDidBecomeActive:

Tells the delegate that the app has become active.

- applicationWillResignActive:

Tells the delegate that the app is about to become inactive.

- applicationDidEnterBackground:

Tells the delegate that the app is now in the background.

- applicationWillEnterForeground:

Tells the delegate that the app is about to enter the foreground.

- applicationWillTerminate:

Tells the delegate when the app is about to terminate.

UIApplicationDidEnterBackgroundNotification

Posted when the app enters the background.

UIApplicationWillEnterForegroundNotification

Posted shortly before an app leaves the background state on its way to becoming the active app.

UIApplicationWillResignActiveNotification

Posted when the app is no longer active and loses focus.

UIApplicationWillTerminateNotification

Posted when the app is about to terminate.