Run task when app enter background.

1. Add the

UIBackgroundModes

key to your application’s

Info.plist

file. Set the value of this key to an array that includes the

voip

string.

2.

- (void)applicationDidEnterBackground:(UIApplication *)application

{

/*

Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.

If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.

*/

#if __IPHONE_OS_VERSION_MIN_REQUIRED >= 40000

if([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)] && [[UIDevice currentDevice] isMultitaskingSupported])

{

NSLog(@"Keep timeout alive");

[application setKeepAliveTimeout:600 handler: ^{

NSLog(@"applicationDidEnterBackground:: setKeepAliveTimeout:handler^");//task as you want to do

}];

}

#else

LogInfo(@"applicationDidEnterBackground (Not supported)");

#endif

}