-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 5/10/11 8:44 PM, G S wrote: > We have a network-dependent app that will suffer from lengthy delays if > connectivity is poor. We've found that if the user quits the app during a > long network activity, the app will often crash upon its next launch. > > Why? It shouldn't be retaining any state between launches.
On iOS >= 4 this is not true. Even without explicitly opting into multitasking (e.g. by declaring background operations, termination handlers, etc.), on "quit" apps are not terminated but suspended (i.e. state is kept in memory and restored when the app is relaunched). The app may still be terminated either by the user force-quitting it (probably only power users do this) or if the operating system needs to free up memory by purging apps that have been suspended for a while. Your app delegate gets various notifications/messages that it can use to perform appropriate actions at the various points in the life cycle, and it sounds like you might need to do this. These are discussed in detail in the section "The Application Life Cycle" at http://developer.apple.com/library/ios/#documentation/iphone/conceptual/iphoneosprogrammingguide/CoreApplication/CoreApplication.html. In particular, you may want to examine: –applicationDidEnterBackground: –applicationWillEnterForeground: –applicationWillTerminate: Also note that, depending on what you are trying to do, it may make sense to do some network actions as a background task that will continue (for a time) even after the app is suspended; look into UIApplication's - -beginBackgroundTaskWithExpirationHandler: method if you want to go down this road. - -- Conrad Shultz Synthetiq Solutions www.synthetiqsolutions.com -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iD8DBQFNyg00aOlrz5+0JdURAttpAJ92CfUEZggLr4JccnXlrryn1s0glwCffDvS mgK1i7Zb1Ga0Mx+Pnf3mnLs= =eFUl -----END PGP SIGNATURE----- _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
