core-location

问题 I'm working on an app that monitors the user's location. After I call startUpdatingLocation() I can put the app in the background. It continues to update the location. That works well. My question is: can I restart the continuous location updates from a didExitRegion call in the background ? Now if I simply call startUpdatingLocation() again, the app gets killed after 10 seconds. func locationManager(_ manager: CLLocationManager, didExitRegion region: CLRegion) { locationManager

问题 I have this code in my class ViewController : CLLocationManager *locationManager; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. locationManager = [[CLLocationManager alloc] init]; [locationManager requestWhenInUseAuthorization]; } - (IBAction)getCurrentLocation:(id)sender { locationManager.delegate = self; locationManager.desiredAccuracy = kCLLocationAccuracyBest; [locationManager startUpdatingLocation]; } #pragma mark -

问题 It is my first question about that is working if I set default lat and long and now I try to get location current location and use that. Also I following this one Get User's Current Location / Coordinates but failed to reach result. I am not sure what is going on here it is not working try to do it several way func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) { //print(locations) //get the actual location from the device and first one each move let

问题 I have NSLocationWhenInUseUsageDescription and NSLocationAlwaysUsageDescription defined in my Info.plist. In my code I do if ([_locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { [_locationManager requestWhenInUseAuthorization]; } [_locationManager startUpdatingLocation]; And I don't get prompted on iOS8. I did a clean reinstall in my simulator. On iOS7 without the 3 if block I get prompted. Right after startUpdatingLocation I check [CLLocationManager

问题 I have NSLocationWhenInUseUsageDescription and NSLocationAlwaysUsageDescription defined in my Info.plist. In my code I do if ([_locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)]) { [_locationManager requestWhenInUseAuthorization]; } [_locationManager startUpdatingLocation]; And I don't get prompted on iOS8. I did a clean reinstall in my simulator. On iOS7 without the 3 if block I get prompted. Right after startUpdatingLocation I check [CLLocationManager

问题 I am trying to get my app to get the longitude and latitude of the users current position as soon as they load up the app. From here I can tell if they are a certain distance from a point, and call different functions based on this. I can get it to work fine from viewDidLoad, but I don't want it to keep performing this every time said view is loaded. How would I (if possible) call this from the app delegates didFinishLaunchingWithOptions method? 回答1: I think you're looking for

问题 i am adding MKCircleView to the user annotation like so : - (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation { if (!_MapCentered) { **_circle = [MKCircle circleWithCenterCoordinate:userLocation.coordinate radius:3000]; [_map_view addOverlay:_circle];** _MapCentered = YES; } } it will fire once and once the user location has traced, it works well but as you can see the diameter of the circle view is 3000 meters. so now i want the zoom level to fit the

问题 I'm trying to range iOS ibeacons with multiple regions and it works well. But my problem is, if I range multiple regions region1 and region2 , I received two ranging event calls, didRangeBeacons:inRegion separately. (So, if I show the beacons list in tableview, it is flashing.) I want to received all regions with different identifier in ranges into single didRangeBeacons:inRegion callback (not one callback for one region. one callback for all regions in range). I saw it can be done with

问题 I want calculate the center point between my location and some annotation. So far I have done this: CLLocation *myLoc = self.locMgr.location; MKPointAnnotation *middleAnnotation = [locationV.annotations objectAtIndex:locationV.annotations.count/2]; CLLocation *someStuiodLoc = [[CLLocation alloc] initWithLatitude:middleAnnotation.coordinate.latitude longitude:middleAnnotation.coordinate.longitude]; CLLocationDistance dist = [myLoc distanceFromLocation:someStuiodLoc]; How can I calculate the

问题 My question is regarding the creation of regions for regionMonitoring in iOS 5. Can new regions be created based on user of the app's current location? Or do all regions need to be predefined by the developer in the applications binary? I know you can have certain regions register based on the users current location, because the os puts a limit on the number of regions that the phone/app can be monitoring at one time, and you should only register the regions within close proximity to the