iOS extracts: Application Termination
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extracts from 《Beginning iPhone Games Development》
The UIApplicationDelegateclass defines a method calledapplicationWillTerminate:,which is typically called when users quit your application through the iPhone's homebutton, or when they quit your game to answer a phone call, respond to a text message,or respond to any other kind of notification from the operating system. You can use thisdelegate method to save your game’s state, to allow the user to resume your game at alater time.
You don’t need to worry about closing windows, deallocating views, or releasingmemory in theapplicationWillTerminate:method. iPhone OS cleans up after yourapplication shortly after this method is called. You should close any open files andrelease database handles, though. SQLite databases can become corrupt if they are notclosed properly.
You’ll learn more about saving the game state in the “Saving and Loading Game State”section later in this chapter. The important thing to keep in mind is that you have at mosttwo to three seconds to do what you need to save your game’s current state. Youshould save your game state as quickly and efficiently as possible, or else the operatingsystem will kill your app before it’s finished saving all the data, leading to datacorruption.
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