Latitude & Longitude Not Retrieved

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.首先，你应该使用你应该使用实际设备而不是模拟器

2.在界面中实现CLLocationManagerDelegate，如

@interface XXXXX () <CLLocationManagerDelegate>

3.之后

locationManager = [[CLLocationManager alloc] init];

添加

locationManager.delegate = self;

4.实施委托方法

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
    for (CLLocation *location in locations) {
        //you can get locations here

    }
}