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Editorial Team
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Asked: 2026-05-30T20:04:12+00:00

My UIViewController registers for notifications which my model component sends out when it has

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My UIViewController registers for notifications which my model component sends out when it has finished downloading content.

The downloading can occur in the background (by using beginBackgroundTaskWithExpirationHandler:) so obviously I don’t want my GUI to attempt to redraw etc. if the download completes in the background.

So I guess I have two choices – 1) the model knows when its in the background/foreground and doesn’t fire the notifications. 2) the UIViewController deregisters for notifications when its in the background.

Option 2) is preferable.

Is there a method on UIViewController that is always called when the app goes into the background? Or will the UIViewController have to register to receive a notification event when the app moves into the background?

(Seems like viewWillDisappear, viewWillUnload etc. don’t get called when the app moves to the background?)

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1 Answer

  1. Editorial Team

    make your view controller register for UIApplicationDidEnterBackgroundNotification in view did load… the selector method associated will be called before entering background..

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