Why latitude and longitude is showing zero in ios 9? - ios

Question

I have to find the current location and i am using this code
-(CLLocationCoordinate2D) getLocation{
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
[locationManager startUpdatingLocation];
CLLocation *location = [locationManager location];
CLLocationCoordinate2D coordinate = [location coordinate];
return coordinate;
}
- (void)getCurrentLocation{
CLLocationCoordinate2D coordinate = [self getLocation];
NSString *latitude = [NSString stringWithFormat:#"%f", coordinate.latitude];
NSString *longitude = [NSString stringWithFormat:#"%f", coordinate.longitude];
NSLog(#"Latitude = %#", latitude);
NSLog(#"Longitude = %#", longitude);
}
but latitude and longitude is coming zero? and i have called these method in viewDidLoad
[self getCurrentLocation];
[self getLocation];
why is it so please help me. thanks

Answer 1

I hope , Following info can help you:
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#interface yourController : UIViewController <CLLocationManagerDelegate> {
CLLocationManager *locationManager;
}
#end
and add this:
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)
[self.locationManager requestWhenInUseAuthorization];
[locationManager startUpdatingLocation];
Callback function
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
NSLog(#"OldLocation %f %f", oldLocation.coordinate.latitude, oldLocation.coordinate.longitude);
NSLog(#"NewLocation %f %f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
}
You also have to add a string for the
[`NSLocationAlwaysUsageDescription`]

Answer 2

You need to use "CLLocationManagerDelegate".
Just go through this tutorial. How To Get the User Location in iPhone App
Here you will learn about CoreLocation Framework.
This is the delegate method which will return you current lat-long.
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
And also make sure your app authorize to use location services.
And Also run your app on device, or if you want to see the result in simulator, follow the steps mentioned in tutorial.
Step 1 : #import <CoreLocation/CoreLocation.h> import framework. Also add framework in your project.
Step 2 : Make sure your view-controller implement CLLocationManagerDelegate
#interface MyLocationViewController : UIViewController <CLLocationManagerDelegate>
Step 3 : Define class instance of CLLocationManager
#implementation MyLocationViewController {
CLLocationManager *locationManager;
}
Step 4 :
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
locationManager = [[CLLocationManager alloc] init];
if([locationManager respondsToSelector:#selector(requestAlwaysAuthorization)]) {
//iOS 8.0 onwards
[locationManager requestAlwaysAuthorization];
}
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
Step 5 : Here is your CLLocationManagerDelegate
method implementation
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"didFailWithError: %#", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:#"Error" message:#"Failed to Get Your Location" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
NSLog(#"Longitude %.8f",currentLocation.coordinate.longitude);
NSLog(#"Latitude %.8f",currentLocation.coordinate.latitude);
}
}

Answer 3

First go to your info.plist and right click on it and select the source code option.
Then add the following lines after the <dict> keyword
<key>NSLocationAlwaysUsageDescription</key>
<string>This App wants to Know your location</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>This App wants to Know your location</string>
Without this, you can't get CLLocation working in iOS 9.0.
Now follow the instruction.
Import
#import <CoreLocation/CoreLocation.h>
and list the CoreLocation delegate like
#interface ViewController ()<CLLocationManagerDelegate>
#property (strong, nonatomic) CLLocationManager *locationManager;
#end
Then in the viewDidLoad method add the following lines-
self.locationManager = [[CLLocationManager alloc]init];
self.locationManager.delegate=self;
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
if ([self.locationManager respondsToSelector:#selector(requestWhenInUseAuthorization)]){
[self.locationManager requestWhenInUseAuthorization];
}
[self.locationManager startUpdatingLocation];
Now implement the delegate methods
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"didFailWithError: %#", error);
UIAlertView *errorAlert = [[UIAlertView alloc]
initWithTitle:#"Sorry"
message:#"Failed to Get Your Location"
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
NSLog(#"%#", [NSString stringWithFormat:#"%.4f", currentLocation.coordinate.longitude]);
NSLog(#"%#", [NSString stringWithFormat:#"%.4f", currentLocation.coordinate.latitude]);
}
}

Answer 4

It takes some time for the CLLocationManager to get the coordinates. Therefore, the CLLocationManager uses a delegate to notify when it received the location updates. Therefore, you cannot get the result immediately. Please have a look at this post to see how it's done.

Answer 5

Well, I wanted you to read the doc, still I am posting the solution.
-(void)viewDidLoad{
[self initLocationManager];
}
-(void)initLocationManager{
self.locationManager=[[CLLocationManager alloc] init];
self.locationManager.delegate=self;
if (([_locationManager respondsToSelector:#selector(requestWhenInUseAuthorization)])) {
[_locationManager requestWhenInUseAuthorization];
}
self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
self.locationManager.distanceFilter = kCLDistanceFilterNone;
[self.locationManager startUpdatingLocation];
}
Then handle the location updates in the CLLocationManager delegate method like below
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations{
// If it's a relatively recent event, turn off updates to save power.
CLLocation* location = [locations lastObject];
NSDate* eventDate = location.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if (abs(howRecent) < 15.0) {
NSLog(#"%f,%f",location.coordinate.latitude,location.coordinate.longitude);
}
}
Update
To make it work, you need to do two things
Enable Background Modes from Capabilities Tab, and choose Location Updates, see image below
Add NSLocationWhenInUseUsageDescription in Info Tab, into the plist, see image
It will start working.
Hope it helps. Cheers.

Answer 6

Use this code it works
firstly add NSLocationAlwaysUsageDescription as string in info.plist
in .h
#import <CoreLocation/CoreLocation.h>
#interface ExamListVC : UIViewController<CLLocationManagerDelegate>
{
CLLocationManager * locationManager;
}
#end
in .m use this code
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view.
locationManager . delegate = self;
[self initLocationManager];
}
-(void)initLocationManager
{
locationManager=[[CLLocationManager alloc] init];
locationManager.delegate=self;
if (([locationManager respondsToSelector:#selector(requestWhenInUseAuthorization)]))
{
[locationManager requestWhenInUseAuthorization];
}
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = kCLDistanceFilterNone;
[locationManager startUpdatingLocation];
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation* location = [locations lastObject];
NSDate* eventDate = location.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if (abs(howRecent) < 15.0)
{
NSLog(#"Current Coordinates are %f,%f",location.coordinate.latitude,location.coordinate.longitude);
[locationManager stopUpdatingLocation];
}
}
it will give output like
[2390:96060] Current Coordinates are 37.332331,-122.031219