Why I am not able to get Latitude and longitude on real device in Objective C - objective-c

Question

I am new in iOS and I am facing problem to get current Latitude and Longitude on the real device where as I am able to get latitude and Longitude on simulator.
My code is like this
if (nil == locationManager)
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
//Configure Accuracy depending on your needs, default is kCLLocationAccuracyBest
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
// Set a movement threshold for new events.
locationManager.distanceFilter = kCLDistanceFilterNone; // meters
[locationManager startUpdatingLocation];
Currentlatitude = locationManager.location.coordinate.latitude;
Currentlongitude = locationManager.location.coordinate.longitude;
NSLog(#"Latitude =%f",Currentlatitude);
NSLog(#"Longitude =%f",Currentlongitude);
CheckString=#"2";
// Your location from latitude and longitude
CLLocation *location = [[CLLocation alloc] initWithLatitude:Currentlatitude longitude:Currentlongitude];
// Call the method to find the address
[self getAddressFromLocation:location completionHandler:^(NSMutableDictionary *d) {
NSLog(#"address informations : %#", d);
// NSLog(#"formatted address : %#", [placemark.addressDictionary valueForKey:#"FormattedAddressLines"]);
NSLog(#"Street : %#", [d valueForKey:#"Street"]);
NSLog(#"ZIP code : %#", [d valueForKey:#"ZIP"]);
NSLog(#"City : %#", [d valueForKey:#"City"]);
CityNameCurrent=[d valueForKey:#"City"];
// etc.
} failureHandler:^(NSError *error) {
NSLog(#"Error : %#", error);
}];
- (void)getAddressFromLocation:(CLLocation *)location completionHandler:(void (^)(NSMutableDictionary *placemark))completionHandler failureHandler:(void (^)(NSError *error))failureHandler
{
NSMutableDictionary *d = [NSMutableDictionary new];
CLGeocoder *geocoder = [CLGeocoder new];
[geocoder reverseGeocodeLocation:location completionHandler:^(NSArray *placemarks, NSError *error) {
if (failureHandler && (error || placemarks.count == 0)) {
failureHandler(error);
} else {
CLPlacemark *placemark = [placemarks objectAtIndex:0];
if(completionHandler) {
completionHandler(placemark.addressDictionary);
}
}
}];
}
In ViewDidLod()
mapViewMap.delegate=self;
mapViewMap.myLocationEnabled=YES;
locationtbl.hidden=YES;
if (nil == locationManager)
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
//Configure Accuracy depending on your needs, default is kCLLocationAccuracyBest
locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
// Set a movement threshold for new events.
locationManager.distanceFilter = kCLDistanceFilterNone; // meters
[locationManager startUpdatingLocation];
Currentlatitude = locationManager.location.coordinate.latitude;
Currentlongitude = locationManager.location.coordinate.longitude;
NSLog(#"Latitude =%f",Currentlatitude);
NSLog(#"Longitude =%f",Currentlongitude);
mapViewMap.settings.myLocationButton = YES;
mapViewMap.settings.scrollGestures = YES;
mapViewMap.settings.zoomGestures = YES;
mapViewMap.settings.tiltGestures=YES;
mapViewMap.settings.rotateGestures=NO;
mapViewMap.settings.compassButton = YES;
I am not getting what I am doing wrong.Please help.Thanks in Advance!

Answer 1

The simulator doesn't have to wait for a fix before generating a location. The device does. You have to implement a delegate for the location manager and wait for the delegate to be called with an update.

Answer 2

You need to implement CLLocationManager delegate method didUpdateLocations, it is where you get location updates.
You can do it like this.
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
// latest location
self.currentLocation = [locations lastObject];
float longitude = self.currentLocation.coordinate.longitude;
float latitude = self.currentLocation.coordinate.latitude;
// Here you can perform operations with your location coordinates
}
You also need to add following entries in your .plist file based on your location need.
NSLocationWhenInUseUsageDescription
or
NSLocationAlwaysUsageDescription
And request the permission for location usage by calling
[locationManager requestWhenInUseAuthorization];
or
[locationManager requestAlwaysAuthorization]
Documentation link Location and Maps Programming Guide

Answer 3

You also need to add one (or both) of the following keys to you plist:
NSLocationWhenInUseUsageDescription
or
NSLocationAlwaysUsageDescription
and call correspondingly either
[self.locationManager requestWhenInUseAuthorization]
or
[self.locationManager requestAlwaysAuthorization]