gistfile1.m

#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
    switch (error.code) {
        case kCLErrorLocationUnknown:
            NSLog(@"The location manager was unable to obtain a location value right now.");
            break;
        case kCLErrorDenied:
            NSLog(@"Access to the location service was denied by the user.");
            break;
        case kCLErrorNetwork:
            NSLog(@"The network was unavailable or a network error occurred.");
            break;
        default:
            NSLog(@"未定义错误");
            break;
    }
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
    NSLog(@"oldLocation.coordinate.timestamp:%@", oldLocation.timestamp);
    NSLog(@"oldLocation.coordinate.longitude:%f", oldLocation.coordinate.longitude);
    NSLog(@"oldLocation.coordinate.latitude:%f", oldLocation.coordinate.latitude);
    
    NSLog(@"newLocation.coordinate.timestamp:%@", newLocation.timestamp);
    NSLog(@"newLocation.coordinate.longitude:%f", newLocation.coordinate.longitude);
    NSLog(@"newLocation.coordinate.latitude:%f", newLocation.coordinate.latitude);
    
    NSTimeInterval interval = [newLocation.timestamp timeIntervalSinceDate:oldLocation.timestamp];
    NSLog(@"%lf", interval);
    
    // 取到精确GPS位置后停止更新
    if (interval < 3) {
        // 停止更新
        [locationManager stopUpdatingLocation];
    }
    
    latitudeLabel.text = [NSString stringWithFormat:@"%f", newLocation.coordinate.latitude];
    longitudeLabel.text = [NSString stringWithFormat:@"%f", newLocation.coordinate.longitude];
}