How to get accelerometer data in the background using basic motion?

Question

My requirement in the application is that I have to determine the step counts from the application, and this should continue even in the application running in the background. I learned this; usually an apple does not allow accelerometer data in the background, but I assume that with Core Motion we can achieve it.

Here is my code:

- (void)applicationWillResignActive:(UIApplication *)application { /* Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state. Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.*/ if ([[UIDevice currentDevice] respondsToSelector:@selector(isMultitaskingSupported)]) { //Check if our iOS version supports multitasking IE iOS 4 if ([[UIDevice currentDevice] isMultitaskingSupported]) { //Check if device supports mulitasking backgroundSupported = [UIDevice currentDevice].multitaskingSupported; UIApplication *application = [UIApplication sharedApplication];//Get the shared application instance __block UIBackgroundTaskIdentifier background_task; //Create a task object background_task = [application beginBackgroundTaskWithExpirationHandler: ^ { NSAssert(background_task == UIBackgroundTaskInvalid, nil); [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 dispatch_async(dispatch_get_main_queue(), ^{ if (background_task != UIBackgroundTaskInvalid) { [application endBackgroundTask:background_task]; background_task = UIBackgroundTaskInvalid; } }); locationManager.delegate = self;//or whatever class you have for managing location [locationManager startMonitoringSignificantLocationChanges]; [locationManager startUpdatingLocation]; NSLog(@"\n\nRunning in the background!\n\n"); // [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 }); } } } - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations { CLLocation *loc = [locations lastObject]; float latitudeMe = loc.coordinate.latitude; float longitudeMe = loc.coordinate.longitude; NSOperationQueue *theQueue = [[NSOperationQueue alloc] init]; CMAccelerometerData *_returnedData = [[CMAccelerometerData alloc] init]; CMMotionManager *_motionManager = [[CMMotionManager alloc] init]; [_motionManager startAccelerometerUpdatesToQueue:theQueue withHandler:^(CMAccelerometerData *accelerometerData, NSError *error) { int x = _motionManager.accelerometerData.acceleration.x; int y = _motionManager.accelerometerData.acceleration.y; int z = _motionManager.accelerometerData.acceleration.z; NSLog(@"X: %i, Y: %i, z: %i", x, y,z); //[self changeFilter:[HighpassFilter class]]; //[filter addAcceleration:acceleration]; const float violence = 1.70; float magnitudeOfAcceleration = sqrt (x*x + y*y + z*z); //float magnitudeOfAcceleration = sqrt (filter.x*filter.x + filter.y * filter.y + filter.z * filter.z); BOOL shake = magnitudeOfAcceleration > violence; if (shake) { step++; } NSUserDefaults *defalut = [NSUserDefaults standardUserDefaults]; [defalut setObject:[NSString stringWithFormat:@"%i",step] forKey:@"Stepscounting"]; }]; } 

Can someone help me where I'm wrong?

I already added in the plist file "Required background modes-> and in element 0 select" Application registers for location updates ".