I have an application that needs to detect the users location an drop some MKAnnotations around it on the MKMapView. How can I get notified about wether the user has selected YES on the Location Services prompt in order to then call my method to get the users location and add the annotations?
This will happen in the location manager delegate didUpdateToLocation;
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
MyAnnotation * annotation = [[MyAnnotation alloc] initWithCoordinate:coordinate];
[self.mapView addAnnotation:annotation];
}
You will need to create a MyAnnotation class. Take a look here: https://stackoverflow.com/a/2878806/1535038
Related
My code is for a Golf player app. I need the exact user location here is my present code
- (void) update_location
{
locationManager_player = [[CLLocationManager alloc] init];
locationManager_player.delegate = self;
locationManager_player.desiredAccuracy = kCLLocationAccuracyBest;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0) {
[locationManager_player requestWhenInUseAuthorization];
}
[locationManager_player startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
// Code to handle the current user location
}
The above delegate method is not giving the exact user location. Perhaps this gives the coordinates which are 30 to 40 yards far from user current position
Thanks in advance
Location accuracy is controlled by the desiredAccuracy property of CLLocationManager. Check what is set in your case. Default value is kCLLocationAccuracyBest. You can set it to kCLLocationAccuracyBestForNavigation but it require more power requirements.
More detail here.
In my app, I am using GMSMapView, and I would like to change tracking mode. In iOS MapKit, I can change the tracking mode to MKUserTrackingModeFollowWithHeading, but don't know how to change it in GMSMapView.
In the app Google Maps, it is working after second touch on myLocationButton. Is it possible?
For continuously changing the camera with the current location, you will need to update the GMSCamera for google maps to current location. You can do it in Location Manager delegate method.
CLLocation *location;
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
//Get current latitude and longitude from didUpdateLocation
location = [locations lastObject];
}
-(void)locationManager:(CLLocationManager *)manager didUpdateHeading:(CLHeading *)newHeading
{
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:location.coordinate.latitude longitude:location.coordinate.longitude zoom:10 bearing:newHeading.trueHeading viewingAngle:0];
//You can change viewingAngle from 0 to 45
[self.mapForView animateToCameraPosition:camera];
}
In case your delegate is not getting called, take help from my answer here
Hope it helps.
I am new in location services. I have used startMonitoringSignificantLocationChanges and (void)locationManager:(CLLocationManager *)manager didUpdateToLocation: (CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation method but it is not getting called as I change location value. I want to fetch location value whenever user change its location.How should i achieve this? Please help me to resolve. Thanks in advance.
You need to implement "didUpdateLocations" delegate method . Here is sample
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
NSLog(#"locations : %#",locations.description);
CLLocation *currentLocation = [locations lastObject];
NSLog(#"current location : %f %f",currentLocation.coordinate.latitude,currentLocation.coordinate.longitude);
}
In iOS 8 you need to do two extra things to get location working:
1. add one or both of the following keys to your Info.plist file:
NSLocationWhenInUseUsageDescription
NSLocationAlwaysUsageDescription
Next you need to request authorization for the corresponding location method, WhenInUse or Background. Use one of these calls:
[self.locationManager requestWhenInUseAuthorization];
[self.locationManager requestAlwaysAuthorization];
For details refer following link. http://nevan.net/2014/09/core-location-manager-changes-in-ios-8/
I init my mapviewControler like this:
- (void)viewDidLoad
{
[super viewDidLoad];
self.firstShow=TRUE;
self.mapView.delegate=self;
self.mapView.showsUserLocation=YES;
self.cllmng=[[CLLocationManager alloc]init];
self.cllmng.delegate=self;
self.cllmng.desiredAccuracy=kCLLocationAccuracyNearestTenMeters;
self.cllmng.distanceFilter=50;
[self.cllmng startUpdatingLocation];
}
and I make mapviewControler implement CLLocationManagerDelegate, and implement - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations in my code.
The problem I have is that I want to init map view centred on current user location with a proper scale. I intend to do this by
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
CLLocation * currentLoci=[locations lastObject];
MKCoordinateRegion r;
MKCoordinateSpan span;
span.latitudeDelta = 1;
span.longitudeDelta = 1;
r.span = span;
CLLocationCoordinate2D c;
c.longitude=currentLoci.coordinate.longitude;
c.latitude=currentLoci.coordinate.latitude;
r.center = c;
[self.mapView setRegion:r animated:YES];
}
But sometimes, after [self.cllmng startUpdatingLocation] called in the -(void) viewDidload, I cannot get a call of - (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations immediately. Thus, the map view just init showing user location but showing the whole Australia. How can I set the scale/span in the init of map view even didUpdateLocations is not triggered? THX!
INstead of modifying the region yourself using a CLLocation manager you could just set the trackingMode of the mapView and it'll center and zoom in on your position automatically. It will be possible for the user to disable the tracking mode if they start dragging the map around, but you can disable user interaction if you really want them to have no control. Here is how to do it
[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
ref: https://developer.apple.com/library/ios/documentation/MapKit/Reference/MKMapView_Class/MKMapView/MKMapView.html#//apple_ref/occ/instm/MKMapView/setUserTrackingMode:animated:
iOS 11.x Swift 4.0 Craigs answer, updated.
mapView.showsUserLocation = true
Not so obvious I fear.
I use this code to get the longitude and latitude.
(void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
NSLog(#"%f",newLocation.coordinate.latitude);
self.location = newLocation;
}
But the longitude and latitude which i got has the excursion with the actual geographical position. How to solve this problem?
You should be testing the accuracy of the CLLocation object that is returned, and making sure it meets your location accuracy criteria.
if (newLocation.horizontalAccuracy > 1000) {
// Throw away this location and wait for another one as this is over 1km away
}
Also, the locationManager:didUpdateToLocation:fromLocation: method has been deprecated in iOS6 so you should use locationManager:didUpdateLocations: if you're targetting iOS6+.