Can UILocalNotification be used to wake up a task that is in the background

Question

I would like to know, if it is possible to somehow \"wake up\" a task that is in the background, to quickly check something on the network.. I think that this could be done

Answer 1

The user has a couple of choices: #1) Do they want to see a notification for your app. #2) If notifications are enabled for your app, do they want to click on your notification to launch your app. If they do accept notifications and open your notification while your app is in the background, application:didReceiveLocalNotification is called. To be clear, the user has to accept the notification (such as sliding the slider underneath the notification)... otherwise NOTHING is called.

- (void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification {
    NSLog(@"%@", notification);
}

If your app has been terminated application:didFinishLaunchingWithOptions: is called -

- (BOOL)application:(UIApplication *) 
application didFinishLaunchingWithOptions:
(NSDictionary *)launchOptions {
    UILocalNotification *theNotification = 
      [launchOptions 
        objectForKey:UIApplicationLaunchOptionsLocalNotificationKey];
    NSLog(@"%@", theNotification);

    return YES;
}