• StandardLocation Service
• Significant-Change Location Service

• Configurable general purpose solution for getting location data.
• Create an instance of CLLocationManager class
• Configure its desired accuracy/distance filter properties.
• Assign delegate to the object and call startUpdatingLocation.
• To stop the delivery of location update call stopUpdatingLocation.

 - (void)startStandardUpdates
{
    // Create the location manager if this object does not
    // already have one.
    if (nil == locationManager)
        locationManager = [[CLLocationManager alloc] init];
 
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
 
    // Set a movement threshold for new events.
    locationManager.distanceFilter = 500; // meters
 
    [locationManager startUpdatingLocation];
}

• Represents a power-saving alternative to the standard location service.
  
• Also wake up an iOS app that is currently suspended or not running in order to deliver new location data.
  
• Create an instance of CLLocationManager class
• Assign delegate to the object and call startMonitoringSignificantLocationChanges.

 - (void)startSignificantChangeUpdates
{
    // Create the location manager if this object does not
    // already have one.
    if (nil == locationManager)
        locationManager = [[CLLocationManager alloc] init];
 
    locationManager.delegate = self;
    [locationManager startMonitoringSignificantLocationChanges];
}

• Way of receiving event is same.
  
• Processing an incoming location event

•  // Delegate method from the CLLocationManagerDelegate protocol.
  - (void)locationManager:(CLLocationManager *)manager
        didUpdateLocations:(NSArray *)locations {
      // If it's a relatively recent event, turn off updates to save power.
     CLLocation* location = [locations lastObject];
     NSDate* eventDate = location.timestamp;
     NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
     if (abs(howRecent) < 15.0) {
        // If the event is recent, do something with it.
        NSLog(@"latitude %+.6f, longitude %+.6f\n",
                location.coordinate.latitude,
                location.coordinate.longitude);
     }
  }

• A geographical region
  
• a beacon region
  

• Define geographical regions using the CLCircularRegion class.
  
• Region must include both the data that defines the desired geographic area and a unique identifier string.
• To register a region, call the startMonitoringForRegion
  
• Only boundary crossings generate an event.

 // Create the geographic region to be monitored.
CLCircularRegion *geoRegion = [[CLCircularRegion alloc]
      initWithCenter:overlay.coordinate
              radius:radius
          identifier:identifier];
   [self.locManager startMonitoringForRegion:geoRegion];

• Handling Boundary-Crossing

 locationManager:didEnterRegion: locationManager:didExitRegion:

• A beacon region is an area defined by the device’s proximity to Bluetooth low-energy beacons.
  
• devices that advertise a particular Bluetooth low-energy payload.
  
• core bluetooth framework.
• Bluetooth low-energy beacons that advertise a combination of the following values:
•       
• A proximity UUID ($ uuidgen)
• A major value (optional)
• A minor value (optional)

 // Create a NSUUID object
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"A77A1B68-49A7-4DBF-914C-760D07FBB87B"];
    
    // Initialize the Beacon Region
    self.myBeaconRegion = [[CLBeaconRegion alloc]           initWithProximityUUID:uuid                                                                  major:1                                                                  minor:1                                                             identifier:@"com.appcoda.testregion"];

• CBPeripheralManager class
• In Core Bluetooth, a peripheral is a device that advertises and shares data using Bluetooth low energy.

•  // Create the peripheral manager.   CBPeripheralManager *peripheralManager = [[CBPeripheralManager alloc]
        initWithDelegate:selfqueue:nil options:nil];
   
     // Start advertising your beacon's data.
     [peripheralManager startAdvertising:beaconPeripheralData];

  self.locationManager = [[CLLocationManager alloc] init];    self.locationManager.delegate = self;
    
    // Create a NSUUID with the same UUID as the broadcasting beacon
    NSUUID *uuid = [[NSUUID alloc] initWithUUIDString:@"A77A1B68-49A7-4DBF-914C-760D07FBB87B"];
    
    // Setup a new region with that UUID and same identifier as the broadcasting beacon
    self.myBeaconRegion = [[CLBeaconRegion alloc] initWithProximityUUID:uuid
                                                             identifier:@"com.appcoda.testregion"];
    
    // Tell location manager to start monitoring for the beacon region
    [self.locationManager startMonitoringForRegion:self.myBeaconRegion];