Getting Longitude/Latitude of the User When the viewDidLoad - ios

Question

My purpose is to get the longitude/latitude of the user when the view is loaded and to store the values in two variables for later calculations. I don't need to track the user location and to update it, I simply need to get his/her coordinates once. My code looks like this:
- (void)viewDidLoad {
[super viewDidLoad];
// locationManager update as location
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
[locationManager startUpdatingLocation];
CLLocation *location = [locationManager location];
// Configure the new event with information from the location
CLLocationCoordinate2D coordinate = [location coordinate];
float longitude=coordinate.longitude;
float latitude=coordinate.latitude;
NSLog(#"dLongitude : %f",longitude);
NSLog(#"dLatitude : %f", latitude);
}
In the console i keep getting this:
dLongitude : 0.000000
dLatitude : 0.000000
Can you please help me there?

Answer 1

To get user's location even once you need to make locationManager to start updating locations (you did that) and implement delegate method that manager calls when location is retrieved - you can't get location from location manager immediately.
If you don't want to track user location - just stop updating locations in that delegate method after location was fetched for the 1st time (and store it if you need it in future).

Answer 2

As soon as you call [locationManager startUpdatingLocation]; your viewDidLoad method is done. You need to implement
-(void) locationManager: (CLLocationManager *)manager didUpdateToLocation: (CLLocation *) newLocation
fromLocation: (CLLocation *) oldLocation
and
- (void) locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
which will be called by your locationManager when it gets the location, or when it fails. In both of those methods, you can call [locationManager stopUpdatingLocation].
Inside the didUpdateToLocation method, you should move all your code from viewDidLoad, starting with CLLocation *location = [locationManager location]; That's where you'll get proper values.

Answer 3

This worked for me
- (void)viewDidLoad {
[super viewDidLoad];
// locationManager update as location
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
[locationManager startUpdatingLocation];
[locationManager stopUpdatingLocation];
CLLocation *location = [locationManager location];
// Configure the new event with information from the location
float longitude=location.coordinate.longitude;
float latitude=location.coordinate.latitude;
NSLog(#"dLongitude : %f", longitude);
NSLog(#"dLatitude : %f", latitude);
}

Answer 4

Try this Code
-(IBAction)Button:(id)sender
{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
[locationManager startUpdatingLocation];
CLLocation *location = [locationManager location];
// Configure the new event with information from the location
CLLocationCoordinate2D coordinate = [location coordinate];
NSString *latitude = [NSString stringWithFormat:#"%f", coordinate.latitude];
NSString *longitude = [NSString stringWithFormat:#"%f", coordinate.longitude];
NSLog(#"dLatitude : %#", latitude);
NSLog(#"dLongitude : %#",longitude);
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(50, 40, 250, 50)];
UILabel *myLabel = [[UILabel alloc] initWithFrame:CGRectMake(50, 80, 200, 50)];
UILabel *myLabel1 = [[UILabel alloc] initWithFrame:CGRectMake(50, 120, 200, 100)];
myLabel.textColor = [UIColor blackColor];
myLabel1.textColor = [UIColor blackColor];
label.backgroundColor = [UIColor clearColor];
myLabel.backgroundColor = [UIColor clearColor];
myLabel1.backgroundColor = [UIColor clearColor];
[myLabel setText:latitude];
[myLabel1 setText:longitude];
label.text = #"Current Latitude And Longitude";
[self.view addSubview:label];
[self.view addSubview:myLabel];
[self.view addSubview:myLabel1];
}

Answer 5

if you are getting Lat lang both (0.00 ,0.00)
this may be solution for your ,
step 1:
NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription
Add these two key in Info.plist
step 2:
And than [locationManager startUpdatingLocation]; start updating
step 3:
and you need to implement
two mehthods
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
CLLocation * currentLocation = [locations lastObject];
NSLog(#"Updated Lat %f",currentLocation.coordinate.longitude);
NSLog(#"Updated Lang %f",currentLocation.coordinate.latitude);
}
of CLLocationManagerDelegate in your ViewController interface.
**step 4:**
-(void)viewDidLoad
{
[super viewDidLoad];
geocoder = [[CLGeocoder alloc] init];
manager.delegate = self;
manager.desiredAccuracy = kCLLocationAccuracyBest;
[manager requestWhenInUseAuthorization];
[manager requestAlwaysAuthorization];
[manager startUpdatingLocation];
}