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  • User's location update on server when app is in background.

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    Code for those Apps where we need to update user's current location in regular interval of time even if app is in background state.

    In Appdelegate.h write this code:-

    @property (nonatomic,strong) UIBackgroundTaskIdentifier *bgTask;

    In AppDelegate.m write this code:-

    -(void) applicationDidEnterBackground:(UIApplication *) application
    {
        // First tracking and check that you are on a device that supports this feature.
        // Also you will want to see if location services are enabled at all.
    
           [locationManager startMonitoringSignificantLocationChanges];
    }
    -(void) applicationDidBecomeActive:(UIApplication *) application
    {
           [locationManager stopMonitoringSignificantLocationChanges];
           [locationManager startUpdatingLocation];
    }
    -(void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
    {
        BOOL isInBackground = NO;
        if ([UIApplication sharedApplication].applicationState == UIApplicationStateBackground)
        {
            isInBackground = YES;
        }
    
        // Handle location updates as normal, code omitted.
        if (isInBackground)
        {
            [self sendBackgroundLocationToServer:newLocation];
        }
        else
        {
            // ...
        }
    }
    -(void) sendBackgroundLocationToServer:(CLLocation *)location
    {
        // REMEMBER. We are running in the background if this is being executed.
        // We can't assume normal network access.
        // bgTask is defined as an instance variable of type UIBackgroundTaskIdentifier
    
        // Note that the expiration handler block simply ends the task. It is important that we always
        // end tasks that we have started.
    
        bgTask = [[UIApplication sharedApplication]
                   beginBackgroundTaskWithExpirationHandler:
                   ^{
                       [[UIApplication sharedApplication} endBackgroundTask:bgTask];
                    }];
    
        // ANY CODE WE PUT HERE IS OUR BACKGROUND TASK
    
        // For example, I can do a series of SYNCHRONOUS network methods (we're in the background, there is
        // no UI to block so synchronous is the correct approach here).
    
        // ...
    
        // AFTER ALL THE UPDATES, close the task
    
        if (bgTask != UIBackgroundTaskInvalid)
        {
            [[UIApplication sharedApplication} endBackgroundTask:bgTask];
            bgTask = UIBackgroundTaskInvalid;
        }
    }

    Happy Coding :)

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