几分钟后，Worklight iOS Geofence本机API停止在后台运行

Question

I am developing geofencing application using worklight ios native apis.

I am using worklight 6.1 and testing application on my iPhone4 with ios 7.1.2.

Below is the native ios code i have written to create geofence.

WLGeoAcquisitionPolicy* geoPolicy = [WLGeoAcquisitionPolicy getLiveTrackingProfile];

id<WLDevice> wlDevice = [[WLClient sharedInstance] getWLDevice];

// now, set-up configuration for ongoing acquisition
WLLocationServicesConfiguration* config = [[WLLocationServicesConfiguration alloc] init];

// 1. Acquisition Policy (same one that is used for the one-time acquisition)
WLAcquisitionPolicy* policy = [[WLAcquisitionPolicy alloc] init];
[policy setGeoPolicy: geoPolicy];

[config setPolicy:policy];

WLTriggersConfiguration* triggers = [[WLTriggersConfiguration alloc] init];

WLGeoEnterTrigger *wlTypeAEnterRegionTrigger = [[WLGeoEnterTrigger alloc] init];

[wlTypeAEnterRegionTrigger setArea:[[WLCircle alloc] initWithCenter:[[WLCoordinate alloc] initWithLatitude:19.5687f longitude:72.8748f] radius:500.0f]];

[wlTypeAEnterRegionTrigger setConfidenceLevel:HIGH];

[wlTypeAEnterRegionTrigger setCallback:[WLCallbackFactory createTriggerCallback:^(id<WLDeviceContext> deviceContext) {
                        @try
                        {

                            [[triggers getGeoTriggers] removeObjectForKey:"Offer1"];

                            [self showLocationNotificationWithOfferID:"Offer1" andDescription:@"offer description"];

                        }
                        @catch (NSException *exception)
                        {
                            NSLog(@"Error Occured in LBSManager::enterTriggerCallBack : %@",[exception description]);
                        }
                    }]];

                    [[triggers getGeoTriggers] setObject:wlTypeAEnterRegionTrigger forKey:"Offer1"];

[config setTriggers:triggers];

[wlDevice startAcquisition:config];

After creating WLGeoEnterTrigger location service icon appears in status bar and after that i am putting application in background after few minutes location service icon disappears.

When i put application in foreground and i get this wlLocationServicesConfiguration as nil.

WLLocationServicesConfiguration *wlLocationServicesConfiguration = [[[WLClient  sharedInstance] getWLDevice] getLocationServicesConfig];

I have also added neccessary BackgroundModes still it does not work.

even if i kill the app i get this wlLocationServicesConfiguration as nil.

WLLocationServicesConfiguration *wlLocationServicesConfiguration = [[[WLClient  sharedInstance] getWLDevice] getLocationServicesConfig];

Answer 1

I believe the answer to the following question may explain it: MobileFirst 6.3 - Enabling location trigger in Background in Hybrid Applications for iOS environment

The answer by Carmel is as follows:

First see this for how to set permissions to run location services in the background: Background Location Services not working in iOS 7

There is limitations in Ios. After couple of minutes of running in the background without any location update the app get suspend and all the location update will be received once the user bring the app back to life.