- (void) publishLocation:(CLLocation *)location {
    NSDate *date = location.timestamp;
    double lat = location.coordinate.latitude;
    double lng = location.coordinate.longitude;
    NSTimeInterval ts = [date timeIntervalSince1970] * 1000;
    
    NSDictionary *payload = @{
        @"lat": @(lat),
        @"lng": @(lng),
        @"ts" : @(ts)
    }
    
    [PushClientManager.defaultManager publishEvent:@"geo" data:payload];
}

<key>UIBackgroundModes</key>
<array>
    ....
    <string>location</string>
    ....
</array>

<key>NSLocationAlwaysUsageDescription</key>
<string>App would like to use your location.</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Allow use to access your current location so we can autofill your start/end</string>

<key>NSLocationAlwaysUsageDescription</key>
<string>App would like to use your location.</string>
<key>NSLocationWhenInUseUsageDescription</key>
<string>Allow use to access your current location so we can autofill your start/end</string>
<key>NSLocationAlwaysAndWhenInUseUsageDescription</key>
<string>Allow use to access your current location Always or InUse</string>

[self.manager.enableLocationOnLaunch = YES];

#import "CoreGeoLocation.h"
.
.
.
CoreGeoLocation *locationManager =  [CoreGeoLocation sharedInstance];

CoreGeoLocation *locationManager =  [CoreGeoLocation sharedInstance];

[locationManager addDelegate:self];
[locationManager setDistanceFilter:50];
[locationManager setPausesAutomaticUpdate:NO];
[locationManager setLocationAutorization:kAlways];
[locationManager setAllowBackgroundLocationUpdates:YES];
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];

[locationManager startLocationUpdate];

- (void) receivedLocationUpdates:(NSArray<CLLocation *> *)locations{
    NSInteger length = locations.count;
    CLLocation *lastLocation = [locations lastObject];
    double latitude = lastLocation.coordinate.latitude;
    double longitude = lastLocation.coordinate.longitude;
    
    NSLog(@"%zd new locations was received, last location (lat:'%f') , (lng:'%f')",
          length,latitude,longitude);
    
    self.locationManager.customizeGeoData = ^NSDictionary * _Nullable
    (CLLocation * _Nullable location) {
        NSDictionary *data = @{@"speed":@(location.speed),
                               @"user":@"ADP"
                               };
        return data;
    };
}

CoreGeoLocation *locationManager =  [CoreGeoLocation sharedInstance];
[locationManager trackMeUntil:3600 byMeter:100];

trackingStateEnumType trackingState = [locationManager trackingMeState];
if (trackingState == kTracking) {
    NSLog(@"We are tracking user...");
} else if (trackingState == kStopped) {
    NSLog(@"Tracking user was stopped...");
} else {
    NSLog(@"Tracking user interval was expired...");
}

[locationManager stopTracking];

[locationManager requestSingleLocation:^(CLLocation * _Nullable location, NSError * _Nullable error) {
    if (location != nil) {
        NSLog(@"Single location was received");
    }
}];

[locationManager startMonitoringSignificantLocationChanges];

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    if ([launchOptions objectForKey:UIApplicationLaunchOptionsLocationKey]){
        //App was launch by location update
        CoreGeoLocation *locationManager =  [CoreGeoLocation sharedInstance];
        [locationManager startLocationUpdate];
    }
}

-(void) startMonitoringRegion:(CLRegion *_Nonnull) region;

-(void) startMonitoringRegion:(CLLocationCoordinate2D) center radius:(CLLocationDistance) radius identifier:(NSString *_Nonnull) identifier;

-(void) startMonitoringRegion:(CLRegion *_Nonnull) region
                  expireCount:(NSInteger) count
                     expireTs:(NSTimeInterval) ts
                 enterMessage:(NSString *_Nullable) enter
                  exitMessage:(NSString *_Nullable) exit;

CLLocationCoordinate2D center = CLLocationCoordinate2DMake(35.759227, 51.401044);
    CLRegion *region = [[CLCircularRegion alloc] initWithCenter:center radius:150 identifier:@"adpDigitalCompany"];
[_locationManager startMonitoringRegion:region];

NSInteger count = 20; // count for enter to region
CLLocationDistance radius = 150; // per meter
CLLocationDegrees lat = 35.759227;
CLLocationDegrees lng = 51.401044;
NSString *exit = @"You exit to AdpDigital company building.....";
NSString *enter = @"Hi dear user, You are close to AdpDigital company building.....";
CLLocationCoordinate2D coordinate = CLLocationCoordinate2DMake(lat, lng);
NSTimeInterval expireTs = [[NSDate dateWithTimeIntervalSinceNow:3600] timeIntervalSince1970];
CLRegion *region = [[CLCircularRegion alloc] initWithCenter:coordinate
                        radius:radius
                        identifier:@"adpDigitalCompany"];
    
[_locationManager startMonitoringRegion:region expireCount:count expireTs:expireTs enterMessage:enter exitMessage:exit];

-(void) didEnterToRegion:(CLRegion *)region{
    NSLog(@"Hi dear user, You are close to AdpDigital company building.....");
}

-(void) didExitFromRegion:(CLRegion *)region{
    NSLog(@"You exit to AdpDigital company building.....");
}
    
-(void) didStartMonitoringRegion:(CLRegion *)region{
    NSLog(@"Start monitoring %@ region",region.identifier);
}

[_locationManager stopMonitoringAllRegions];
[_locationManager stopMonitoringRegion:region];