GeoDemo-ios1

Constants.h

#import <Foundation/Foundation.h>

@interface Constants : NSObject
    #define kBgQueue dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0)
    extern NSString *kGetPOIUrl;
@end

Constants.m

#import "Constants.h"

@implementation Constants
    NSString *kGetPOIUrl = @"http://yoursubdomain.azurewebsites.net/api/Location/FindPointsOfInterestWithinRadius";
@end

CoreLocationController.h

#import <Foundation/Foundation.h>
#import "CoreLocation/CoreLocation.h"

@protocol CoreLocationControllerDelegate
@required
- (void)locationUpdate:(CLLocation *)location; // Our location updates are sent here
- (void)locationError:(NSError *)error; // Any errors are sent here
@end


@interface CoreLocationController : NSObject <CLLocationManagerDelegate> {
	CLLocationManager *locMgr;
	id delegate;
}

@property (nonatomic, retain) CLLocationManager *locMgr;
@property (nonatomic, retain) id delegate;

@end

CoreLocationController.m

#import "CoreLocationController.h"
#import "CoreLocation/CoreLocation.h"


@implementation CoreLocationController
@synthesize locMgr, delegate;

- (id)init {
	self = [super init];
    
	if(self != nil) {
		self.locMgr = [[CLLocationManager alloc] init]; // Create new instance of locMgr
		self.locMgr.delegate = self; // Set the delegate as self.
	}    
	return self;
}

- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
	if([self.delegate conformsToProtocol:@protocol(CoreLocationControllerDelegate)]) {  
        // Check if the class assigning itself as the delegate conforms to our protocol.  If not, the message will go nowhere.  Not good.
		[self.delegate locationUpdate:newLocation];
	}
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
	if([self.delegate conformsToProtocol:@protocol(CoreLocationControllerDelegate)]) {  
        // Check if the class assigning itself as the delegate conforms to our protocol.  If not, the message will go nowhere.  Not good.
		[self.delegate locationError:error];
	}
}

- (void)dealloc {
}

@end

MapAnnotation.h

#import <Foundation/Foundation.h>
#import <MapKit/MapKit.h>

@interface MapAnnotation : NSObject <MKAnnotation> {
    CLLocationCoordinate2D _coordinate;
}
- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate;
@end

MapAnnotation.m

#import "MapAnnotation.h"

@implementation MapAnnotation
@synthesize coordinate = _coordinate;

- (id)initWithCoordinate:(CLLocationCoordinate2D)coordinate
{
    self = [super init];
    
    if (self != nil)
    {
        _coordinate = coordinate;
    }
    
    return self;
}

@end

ViewController.h 1

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>

@interface ViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *labelLatitude;
@property (weak, nonatomic) IBOutlet UILabel *labelLongitude;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
- (IBAction)tapRefresh:(id)sender;

@end

ViewController.h 2

#import <UIKit/UIKit.h>
#import <MapKit/MapKit.h>
#import "CoreLocationController.h"

@interface ViewController : UIViewController<CoreLocationControllerDelegate, MKMapViewDelegate> {
    CoreLocationController *CLController;
    CLLocation * currentLocation;
}
@property (weak, nonatomic) IBOutlet UILabel *labelLatitude;
@property (weak, nonatomic) IBOutlet UILabel *labelLongitude;
@property (weak, nonatomic) IBOutlet MKMapView *mapView;
- (IBAction)tapRefresh:(id)sender;

@end

ViewController.m locationUpdated

- (void)locationUpdate:(CLLocation *)location {
    //Set the private currentLocation field to be the location passed in
    currentLocation = location;
    labelLatitude.text= [NSString stringWithFormat:@"Latitude: %f", [location coordinate].latitude];
    labelLongitude.text = [NSString stringWithFormat:@"Longitude: %f", [location coordinate].longitude];
    
    //Save our long and latitude into defaults for adding a POI later
    NSUserDefaults *prefs = [NSUserDefaults standardUserDefaults];
    [prefs setObject:[NSString stringWithFormat:@"%f", [location coordinate].latitude] forKey:@"Latitude"];
    [prefs setObject:[NSString stringWithFormat:@"%f", [location coordinate].longitude] forKey:@"Longitude"];
    [prefs synchronize];
    
    //Center on our location
    CLLocationCoordinate2D mapCenter = mapView.centerCoordinate;
    mapCenter = [location coordinate];
    [mapView setCenterCoordinate:mapCenter animated:YES];
    
    MKCoordinateRegion theRegion = mapView.region;
    //Here we're only rechecking for POIs if the lat / long delta is a significant amount
    if (theRegion.span.longitudeDelta > 2 ||
        theRegion.span.latitudeDelta > 2) {
        
        //Decreasing the scale will zoom the map in farther
        //Increasing will zoom out
        double scale = .01;
        theRegion.span.longitudeDelta = scale;
        theRegion.span.latitudeDelta = scale;
        [mapView setRegion:theRegion animated:YES];
        
        [self getCurrentPointsOfInterest];
    }
}

ViewController.m viewDidLoad

- (void)viewDidLoad
{
    [super viewDidLoad];

    //Start getting the current location
    CLController = [[CoreLocationController alloc] init];
	CLController.delegate = self;
	[CLController.locMgr startUpdatingLocation];
    
    //Set the map view to show the current location and use self for updates
    mapView.showsUserLocation = YES;
    [mapView setDelegate:self];
}