IOS 8 CLLocationManager Issue (Authorization Not Working) - ios

Question

#import "MyLocationViewController.h"
#define NSLog(FORMAT, ...) printf("%s\n", [[NSString stringWithFormat:FORMAT, ##__VA_ARGS__] UTF8String]);
#interface MyLocationViewController ()
#end
#implementation MyLocationViewController
{
CLLocationManager *locationManager;
}
- (void)requestAlwaysAuthorization
{
[locationManager requestAlwaysAuthorization];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.mapView.showsUserLocation = YES;
self.mapView.delegate = self;
locationManager = [[CLLocationManager alloc] init];
}
- (IBAction)unwindToMap:(UIStoryboardSegue *)segue
{
}
- (IBAction)getCurrentLocation:(id)sender {
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
- (void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation
{
MKCoordinateRegion mapRegion;
mapRegion.center = mapView.userLocation.coordinate;
mapRegion.span.latitudeDelta = 0.001;
mapRegion.span.longitudeDelta = 0.001;
CLLocationCoordinate2D location = userLocation.coordinate;
float lat = location.latitude;
float lng = location.longitude;
NSDictionary *locationDictionary = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithFloat:lat] , #"Latitude",
[NSNumber numberWithFloat:lng], #"Longitude", nil];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjectsAndKeys:
locationDictionary, #"Location_A",
nil];
NSError *error;
NSData *jsonData = [NSJSONSerialization dataWithJSONObject:dictionary options:NSJSONWritingPrettyPrinted error:&error];
NSString *str = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSLog(#"%#",str);
if (mapView.userLocation != nil)
{
_longitudeLabel.text = [NSString stringWithFormat:#"%.8f", mapView.userLocation.coordinate.longitude];
_latitudeLabel.text = [NSString stringWithFormat:#"%.8f", mapView.userLocation.coordinate.latitude];
}
[mapView setRegion:mapRegion animated: YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#end
This is my code.
Now, I understand that I needed to edit my info.plist file (which I did) with a NSLocationAlwaysUsageDescription key, and I added a string for the description.
However, I'm having issues implementing the authorization portion, as the error still reads as such:
Trying to start MapKit location updates without prompting for location authorization. Must call -[CLLocationManager requestWhenInUseAuthorization] or -[CLLocationManager requestAlwaysAuthorization] first.
I've read the Apple IOS 8 docs for the CLLocationManager, but somehow my code will not work.
Can someone help me so that the above error message goes away by looking at where in my code I need to modify so that it works?
Thanks!

Answer 1

You should not turn on MKMapView's showsUserLocation before the user has authorised your app to use Location services.
You can implement CLLocationManagerDelegate's locationManager:didChangeAuthorizationStatus: method and turn on showsUserLocation there like so:
- (void)locationManager:(CLLocationManager *)manager didChangeAuthorizationStatus:(CLAuthorizationStatus)status {
if (status == kCLAuthorizationStatusAuthorizedAlways || status == kCLAuthorizationStatusAuthorizedWhenInUse) {
self.mapView.showsUserLocation = YES;
}
}