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Editorial Team
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Asked: 2026-05-24T00:47:16+00:00

I am writing a utility where data for games is written to disk at

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I am writing a utility where data for games is written to disk at various stages throughout the game (including, but not relying on when the app exits). My question is currently I am doing my initial load using application:didFinishLaunchingWithOptions: but was curious about what happens when the application goes into the background / is suspended etc. Currently I am assuming that all my loaded data will hang around and I only need to do a load when the application initially loads. Is this the case or can iOS flush my stored data and I should look at checking if a load is needed in say applicationWillEnterForeground:

Also its a pretty small amount of data (20 small NSArray objects) but I guess I could always save and clear the data store when I get applicationDidEnterBackground: and reload on applicationWillEnterForeground: Or given that its just a small about of data would I be better to just leave it resident at all times?

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1 Answer

  1. Editorial Team

    Save your state when you get applicationWillResignActive:

    That happens when you go into the background, or get a phone call, or several other interruptions occur. This is a better place than applicationDidEnterBackground: since that doesn’t get called in devices running pre iOS 4.0 (which only matters if you support ios < 4).

    Once your app goes into the background or is interrupted it can get killed without any warning, so this is your last sure chance to save/flush state data.

    There is no need to reload data when you return to the foreground. If that happens, your app is still in memory with its data still there (except possibly view(s) may have been unloaded)

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