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In versions of the iOS prior to 4, when the user pressed the Home button, your application was terminated Now the default behavior is to leave your application in memory and just suspend it Then if the user wants to return to it later, it can launch instantly and they re exactly where they left off We actually had to turn this behavior off in the encoding task so that it would terminate and save our test data For simple apps that launch quickly and aren t likely to be returned to over and over, it makes sense to set that flag and not worry about coding for application suspension However, for more complex applications your users will really appreciate being able to switch to another app and then instantly return to yours, continuing right where they left off So, what does this have to do with archiving If all the iOS ever did was temporarily freeze your app in memory and then continue it later, there wouldn t be any need for persistence But, if iOS runs low on memory or the user doesn t return to your application for a while, then it can be purged from memory without warning This creates unpredictable behavior for your users Sometimes when they switch to another app and then return to yours, everything is exactly as they left it (eg, they re in the middle of a gaming level or tunneled deeply down into some nested UITableViews) Other times, when they return to your app it seems to be starting up fresh (because it is iOS had to purge it from memory) The recommended way to deal with this inconsistency is to always save away enough state information when your application is suspended so that you can restore it to the exact same context if your application is purged from memory before the user can return to it That s where archiving comes in The state information you ll need to save is going to be different for every application, but the easiest way to save that information is going to be a set of objects serialized and archived to a file in the application s Documents directory For a game you might need to serialize a number indicating the level they were on along with a hierarchy of objects that encode the state of enemies, puzzles, etc, on that level For a reference application that browses hierarchical data, it might be saving a trail of which item they chose at each level and where they were scrolled to on the current view In either case, you will likely want to implement the NSCoding protocol for a selection of objects, so that you can archive them when your application is suspended Implement the applicationDidEnterBackground method in your AppDelegate class and save your state information there as well as freeing up any resources you don t need.

Implement the applicationWillEnterForeground method in your AppDelegate class to restore your state information

That s it just three rules. You ll be safe if you remember the mantra, If I get it from new, alloc, or copy, I have to release or autorelease it. Whenever you get hold of an object, you must be aware of two things: how you got it, and how long you plan on hanging on to it (see Table 9-1).

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15:

Let s take a look at some common memory-management life cycle scenarios. In the first, you re using an object, temporarily, in the course of some code, but you re not going to be keeping it around for very long. If you get the object from new, alloc, or copy, you need to arrange its demise, usually with a release:

Summary

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NSMutableArray *array; array = [[NSMutableArray alloc] init]; // count: 1 // use the array [array release]; // count: 0

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