core-location

I have the app that use CoreLocation and track user movement. When user is walking or driving I save each coordinate to local database (lat/lng/alt) so I can draw route based on saved coordinates. A few days ago I have added Cumulative elevation gain and I use this code in didLocationUpdate: - (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation { netElevationGain += MAX(0, oldLocation.altitude - newLocation.altitude); } But something is just wrong. I started the application and start walking and walking around

Here is my scenario. In my app there is no need of continuously monitoring user location, but I need the location to be as accurate as possible. So I just call CLLocationManager startUpdatingLocation with kCLLocationAccuracyBestForNavigation set as desiredAccuracy, and after I get the location with my desired accuracy (by comparing newLocation.horizontalAccuracy with predefined value) I want to stop the location update and revoke update again after several seconds. But when I call stopUpdatingLocation the location icon from status bar disappears after about 10 seconds, does this mean that

I have a dictionary with a collection of n number of latitude, longitude and address. I want to calculate which (latitude and langitude)point is closest from current user location(latitude ,langitude) in ios? Thanks in advance Kumar KL If you want to calculate based on the co-ordinates , here is simple scenario : Just take all of the "CLLocationCoordinate2D" from your dictionary . For ex: MKPointAnnotation *annotaion=[MKPointAnnotaion alloc]alloc]; CLLocationCoordinate2D pointACoordinate = [annotation coordinate]; // If you have the co-ordinates in hand , then just make " CLLocation *loc2; "

I have a MKPinAnnotationView that is always in the center of the map. When panning and zooming the pin gives me the center coordinates (lat/long) of the map. Currently when you zoom in, it just zooms into wherever your directing the map to zoom into. I'd really like to lock the zoom onto the pin. Any ideas on how I'd achieve this? Assuming by MKPinAnnotation you mean MKPinAnnotationView, you can access the annotation's coordinate and use that to create a region and subsequently set the region of the mapView to that region centered on the coordinate: MKCoordinateRegion region =

When I debug code below, I see that span is changed by mapkit from what I have provided. span2 contains different numbers from what was provided. Why is this happening? - (void) viewDidLoad { [super viewDidLoad]; CLLocationCoordinate2D loc; loc.latitude = self.atm.lat; loc.longitude = self.atm.lon; MKCoordinateSpan span1 = MKCoordinateSpanMake(0.05f, 0.05f); self.mapView.region = MKCoordinateRegionMake(loc, span1); // at this point numbers are not 0.05 anymore MKCoordinateSpan span2 = self.mapView.region.span; // ... more code } Note that latitude and longitude change differently so square

I am developing Core-Location based iPhone application and there is some strange error. When I send app in the background state and send it back to foreground, in main thread is error named MKNormalizedPointForLayer and nothing more. Where I have to go to find solution? Google is poor about it. 来源： https://stackoverflow.com/questions/9766272/error-in-main-thread-mknormalizedpointforlayer

Is there a function on CLLocationManager or UIApplication to revoke location permission that is similar to the function unregisterForRemoteNotifications to revoke the push notification permission? The stopUpdatingLocation function on CLLocation does not revoke the permission. Once a user has granted (or denied) location permissions by responding to the original permission request dialog, the only way that the permissions can be changed is by the user themselves using the device settings app. You can just not use location services even though your app still has permission to do so. 来源： https:/