How keep NSTimer when application entering background?

Question

I\'m here because a didn\'t find any solutions for my issue :(

I\'m doing an simple application in which i have to send (by socket) some informations to a server (li

Answer 1

You need to read the guide on how to run tasks in the background:

Background Execution and Multitasking

Here is my applicationDidEnterBackground for one of my apps. When I put it to the background, it does some disk cache maintenance:

- (void)applicationDidEnterBackground:(UIApplication *)application {

//As we are going into the background, I want to start a background task to clean up the disk caches
if ([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)]) { //Check if our iOS version supports multitasking I.E iOS 4
    if ([[UIDevice currentDevice] isMultitaskingSupported]) { //Check if device supports mulitasking
        UIApplication *application = [UIApplication sharedApplication]; //Get the shared application instance

        __block UIBackgroundTaskIdentifier background_task; //Create a task object

        background_task = [application beginBackgroundTaskWithExpirationHandler: ^{
            [application endBackgroundTask:background_task]; //Tell the system that we are done with the tasks
            background_task = UIBackgroundTaskInvalid; //Set the task to be invalid
            //System will be shutting down the app at any point in time now
        }];

        //Background tasks require you to use asyncrous tasks
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
            //Perform your tasks that your application requires                

            //I do what i need to do here.... synchronously...                

            [application endBackgroundTask: background_task]; //End the task so the system knows that you are done with what you need to perform
            background_task = UIBackgroundTaskInvalid; //Invalidate the background_task
        });
    }
}

}