iOS 8 location service permission

Question

How can I get permission from the user to access location service from a non UI class (iOS 8 and above)? No matter what I do - requestWhenInUseAuthorization doesn't alert the user. I'm using objective c.

I have added the key in the plist file as well.

LocationController.h

@interface LocationController : NSObject <CLLocationManagerDelegate>{
    BOOL _debug;
}

@property (strong, nonatomic) CLLocationManager *locationManager;

@property (strong, nonatomic) CLLocation *location;

- (id)initWithDebug:(BOOL)debug_flag;

@end

LocationController.m

@implementation LocationController  {
}

@synthesize debug, locationManager, location;

#define IOS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

- (id)initWithDebug:(BOOL)debug_flag {
    self = [super init];
   if (self) {
    [self findLocation];
   }
   return self;
}


-(void) findLocation{
    self.locationManager = [[CLLocationManager  alloc] init];
    self.locationManager.delegate = self;
    self.locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    self.locationManager.distanceFilter = kCLDistanceFilterNone;
    [self checkLocationPermissions];
    self.location = self.locationManager.location;
}

-(void)checkLocationPermissions {
    if ([CLLocationManager locationServicesEnabled]) {
        if (IOS_8_OR_LATER) {
            [self.locationManager requestWhenInUseAuthorization];
        } else {
            [self.locationManager startUpdatingLocation];
        }
    }
}

#pragma mark - CLLocationManagerDelegate
- (void)locationManager:(CLLocationManager*)manager    didChangeAuthorizationStatus:(CLAuthorizationStatus)status
{
    switch (status) {
        case kCLAuthorizationStatusNotDetermined: {
            [self.locationManager startUpdatingLocation];
        } break;
        case kCLAuthorizationStatusDenied: {
            [self.locationManager stopUpdatingLocation];
        } break;
        case kCLAuthorizationStatusAuthorizedWhenInUse:
        case kCLAuthorizationStatusAuthorizedAlways: {
            [self.locationManager startUpdatingLocation];
        } break;
        default:
            break;
    }
}

@end

EDIT: The code reaches till [self.locationManager requestWhenInUseAuthorization]; but never shows the alert.

This code is called from a blockOperation in a SDK. The SDK is initialised as singleton

Answer 1

Apparently in iOS 8 SDK, requestAlwaysAuthorization (for background location) or requestWhenInUseAuthorization (location only when foreground) call on CLLocationManager is needed before starting location updates.

There also needs to be NSLocationAlwaysUsageDescription or NSLocationWhenInUseUsageDescription key in Info.plist with a message to be displayed in the prompt. Adding these solved my problem.

try this one

    #define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)

   //In ViewDidLoad
   if(IS_OS_8_OR_LATER) {
         [self.locationManager requestAlwaysAuthorization];
   }

   [self.locationManager startUpdatingLocation];

More detail refer this link -----> http://nevan.net/2014/09/core-location-manager-changes-in-ios-8/

Answer 2

Add this in your .m file:

 #define IS_OS_8_OR_LATER ([[[UIDevice currentDevice] systemVersion] floatValue] >= 8.0)


#import "ViewController.h"
 @interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];




// Do any additional setup after loading the view, typically from a nib.



self.locationManager = [[CLLocationManager alloc] init];
self.locationManager.delegate = self;

#ifdef __IPHONE_8_0

if(IS_OS_8_OR_LATER) {
    // Use one or the other, not both. Depending on what you put in info.plist
    [self.locationManager requestWhenInUseAuthorization];
    [self.locationManager requestAlwaysAuthorization];
}

#endif [self.locationManager startUpdatingLocation];

NSLog(@"latitude: %f, longitude: %f",self.locationManager.location.coordinate.latitude,self.locationManager.location.coordinate.longitude);

}

Answer 3

Add framework to your project and import to your viewcontroller: CoreLocation.framework

Add this delegate to you viewcontroller: CLLocationManagerDelegate

Add key-value in .plist file: NSLocationWhenInUseUsageDescription : "Your message"

EDIT

+ (YourNSObjectClasssName*)sharedInstance {

    @synchronized(self) {
        if (location == nil) {
            location = [[super allocWithZone:NULL] init] ;
        }
    }
    return location;
}

- (id)init
{
    self = [super init];
    if (self) {}
    return self;
}

#pragma mark - Start Location Updates

-(void)startLocationUpdate{

    CLLocationManager *locationManager = [[CLLocationManager alloc]init];
    locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
    locationManager.delegate = self;
    locationManager.distanceFilter = 10.0f;

    if(![CLLocationManager locationServicesEnabled] ||
       [CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied){

        UIAlertView* failedStatus=[[UIAlertView alloc]initWithTitle:APP_NAME
                                                            message:@"Would like to Use your location Please Enable Location Service in Setting"
                                                           delegate:self
                                                  cancelButtonTitle:@"Setting"
                                                  otherButtonTitles:@"Cancel", nil];
        [failedStatus show];
    }
    else if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusDenied) {
        [locationManager requestWhenInUseAuthorization];
    }
    else{
        [locationManager startUpdatingLocation];
        [locationManager startMonitoringSignificantLocationChanges];
    }
}

And this how you will call startUpdate function from another classes

[[LocationTracker sharedInstance] startLocationUpdate];

Here I am not adding condition for < iOS 8.0. For that you can refer Vijay's answer. (Here distanceFilter = 10.0 is updating location if user moves more than 10 meters.)

If this code still not work then try below case:

• Delete your application from iPhone and restart your device.
• Change your iPhone date and date different should be more than 24 hours and again restart your iPhone.
• Run your app It will ask you for permission.

Main reason behind this is apple will ask for any permission to access users privacy is more than 24 hours.

Hope this might help you.