Checking location service permission on iOS

Tested on iOS 9.2

For getting location updates we should always check

• Location services enabled on user's iOS Device and
• Location services enabled for particular app

and launching user on correct settings screen to enable

Launch iOS Device Location Settings page

Step.1 Go to Project settings --> Info --> URL Types --> Add New URL Schemes

Step.2 Use below code to launch direct phone's location settings page: (Note: The URL Scheme is different in iOS 10+, we check the version as stated here)

 #define SYSTEM_VERSION_LESS_THAN(v)  ([[[UIDevice 
 currentDevice] systemVersion] compare:v options:NSNumericSearch] == 
 NSOrderedAscending)

 //Usage
NSString* url = SYSTEM_VERSION_LESS_THAN(@"10.0") ? @"prefs:root=LOCATION_SERVICES" : @"App-Prefs:root=Privacy&path=LOCATION";
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];

Launch Application Location Settings page

Use below code to launch direct application's location settings page

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];

Here is the full code example :

#define SYSTEM_VERSION_LESS_THAN(v)  ([[[UIDevice 
 currentDevice] systemVersion] compare:v options:NSNumericSearch] == 
 NSOrderedAscending)


CLLocationManager *locationManager;

-(void) checkLocationServicesAndStartUpdates
{
    locationManager = [[CLLocationManager alloc] init];
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;

    if ([locationManager respondsToSelector:@selector(requestWhenInUseAuthorization)])
    {
        [locationManager requestWhenInUseAuthorization];
    }

    //Checking authorization status
    if (![CLLocationManager locationServicesEnabled] && [CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied)
    {

        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:@"Location Services Disabled!"
                                                            message:@"Please enable Location Based Services for better results! We promise to keep your location private"
                                                           delegate:self
                                                  cancelButtonTitle:@"Settings"
                                                  otherButtonTitles:@"Cancel", nil];

        //TODO if user has not given permission to device
        if (![CLLocationManager locationServicesEnabled])
        {
            alertView.tag = 100;
        }
        //TODO if user has not given permission to particular app
        else
        {
            alertView.tag = 200;
        }

        [alertView show];

        return;
    }
    else
    {
        //Location Services Enabled, let's start location updates
        [locationManager startUpdatingLocation];
    }
}

Handle the user click respone, and launch correct location settings

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

    if(buttonIndex == 0)//Settings button pressed
    {
        if (alertView.tag == 100)
        {
            //This will open ios devices location settings
            NSString* url = SYSTEM_VERSION_LESS_THAN(@"10.0") ? @"prefs:root=LOCATION_SERVICES" : @"App-Prefs:root=Privacy&path=LOCATION";
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString: url]];
        }
        else if (alertView.tag == 200)
        {
            //This will opne particular app location settings
            [[UIApplication sharedApplication] openURL:[NSURL URLWithString:UIApplicationOpenSettingsURLString]];
        }
    }
    else if(buttonIndex == 1)//Cancel button pressed.
    {
        //TODO for cancel
    }
}

This is the correct.

if ([CLLocationManager locationServicesEnabled]){

    NSLog(@"Location Services Enabled");

    if ([CLLocationManager authorizationStatus]==kCLAuthorizationStatusDenied){
        alert = [[UIAlertView alloc] initWithTitle:@"App Permission Denied"     
                                           message:@"To re-enable, please go to Settings and turn on Location Service for this app." 
                                          delegate:nil 
                                 cancelButtonTitle:@"OK" 
                                 otherButtonTitles:nil];
        [alert show];
    }
}