Latitude & Longitude Not Retrieved - ios

Question

UPDATED for iOS9: I am new to iOS, experimenting with CoreLocation to return latitude and longitude values. The following code never executes the log output
-(void)viewWillAppear:(BOOL)animated{
manager = [[CLLocationManager alloc]init];
manager.delegate = self;
manager.desiredAccuracy = kCLLocationAccuracyBest;
[manager startUpdatingLocation];
}
Here is my didUpdateToLocation function with is never reached
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray<CLLocation *> *)locations{
NSLog(#"Location: %#", locations);
CLLocation *currentLocation = locations.lastObject;
if (currentLocation != nil) {
float latitude = currentLocation.coordinate.latitude;
float longitude = currentLocation.coordinate.longitude;
NSLog(#"dLongitude : %f", longitude);
NSLog(#"dLatitude : %f", latitude);
}
else{ NSLog(#"ERROR");
}
}

Answer 1

CLLocationManager is asynchronous, You should get the latitude and longitude in the delegate method.
locationManager.delegate = self;
Then implement this delegate method:
- locationManager:didUpdateLocations:

Answer 2

1.first of all, you should use you should use a actual device instead of a simulator
2.implement CLLocationManagerDelegate in the interface,like
#interface XXXXX () <CLLocationManagerDelegate>
3.after
locationManager = [[CLLocationManager alloc] init];
add
locationManager.delegate = self;
4.implement the delegate method
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
for (CLLocation *location in locations) {
//you can get locations here
}
}