Geofencing in Xcode 4, didEnterRegion gives multiple callbacks - objective-c

Question

I'm trying to create an app in Xcode 4 based on geofencing. The app will notify the user when entering a region with certain center coordinates and a certain radius given in meters. All my regions are saved in a p-list. However I get multiple callbacks and more locations than I want gets called (i.e. locations not even in the right location gets called. Below you can see our code. I have also added a kml-layer which you can ignore because it has nothing to do with the fencing. My p-list is an array and contains of 20 items with the type dictionary and the keys are title, latitude, longitude and radius. The radius is set to 50 meters.
ViewController.h
#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#implementation ViewController
#synthesize coordinateLabel;
#synthesize mapView;
CLLocationManager *_locationManager;
NSArray *_regionArray;
- (void)viewDidLoad
{
[super viewDidLoad];
[self initializeMap];
[self initializeLocationManager];
NSArray *geofences = [self buildGeofenceData];
[self initializeRegionMonitoring:geofences];
[self initializeLocationUpdates];
}
- (void)viewDidUnload
{
[self setCoordinateLabel:nil];
[self setMapView:nil];
[super viewDidUnload];
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (void)initializeMap {
CLLocationCoordinate2D initialCoordinate;
initialCoordinate.latitude = 41.88072;
initialCoordinate.longitude = -87.67429;
[self.mapView setRegion:MKCoordinateRegionMakeWithDistance(initialCoordinate, 400, 400) animated:YES];
self.mapView.centerCoordinate = initialCoordinate;
[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
}
- (void)initializeLocationManager {
// Check to ensure location services are enabled
if(![CLLocationManager locationServicesEnabled]) {
[self showAlertWithMessage:#"You need to enable location services to use this app."];
return;
}
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
}
- (void) initializeRegionMonitoring:(NSArray*)geofences {
if (_locationManager == nil) {
[NSException raise:#"Location Manager Not Initialized" format:#"You must initialize location manager first."];
}
if(![CLLocationManager regionMonitoringAvailable]) {
[self showAlertWithMessage:#"This app requires region monitoring features which are unavailable on this device."];
return;
}
for(CLRegion *geofence in geofences) {
[_locationManager startMonitoringForRegion:geofence];
}
}
- (NSArray*) buildGeofenceData {
NSString* plistPath = [[NSBundle mainBundle] pathForResource:#"regions" ofType:#"plist"];
_regionArray = [NSArray arrayWithContentsOfFile:plistPath];
NSMutableArray *geofences = [NSMutableArray array];
for(NSDictionary *regionDict in _regionArray) {
CLRegion *region = [self mapDictionaryToRegion:regionDict];
[geofences addObject:region];
}
return [NSArray arrayWithArray:geofences];
}
- (CLRegion*)mapDictionaryToRegion:(NSDictionary*)dictionary {
NSString *title = [dictionary valueForKey:#"title"];
CLLocationDegrees latitude = [[dictionary valueForKey:#"latitude"] doubleValue];
CLLocationDegrees longitude =[[dictionary valueForKey:#"longitude"] doubleValue];
CLLocationCoordinate2D centerCoordinate = CLLocationCoordinate2DMake(latitude, longitude);
CLLocationDistance regionRadius = [[dictionary valueForKey:#"radius"] doubleValue];
return [[CLRegion alloc] initCircularRegionWithCenter:centerCoordinate
radius:regionRadius
identifier:title];
}
- (void)initializeLocationUpdates {
[_locationManager startUpdatingLocation];
}
#pragma mark - Location Manager - Region Task Methods
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region {
NSLog(#"Entered Region - %#", region.identifier);
[self showRegionAlert:#"Entering Region" forRegion:region.identifier];
}
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
NSLog(#"Exited Region - %#", region.identifier);
[self showRegionAlert:#"Exiting Region" forRegion:region.identifier];
}
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region {
NSLog(#"Started monitoring %# region", region.identifier);
}
#pragma mark - Location Manager - Standard Task Methods
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
self.coordinateLabel.text = [NSString stringWithFormat:#"%f,%f",newLocation.coordinate.latitude, newLocation.coordinate.longitude];
}
#pragma mark - Alert Methods
- (void) showRegionAlert:(NSString *)alertText forRegion:(NSString *)regionIdentifier {
UIAlertView *message = [[UIAlertView alloc] initWithTitle:alertText
message:regionIdentifier
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[message show];
}
- (void)showAlertWithMessage:(NSString*)alertText {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Location Services Error"
message:alertText
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alertView show];
}
#end
ViewController.m
#import "ViewController.h"
#import <CoreLocation/CoreLocation.h>
#implementation ViewController
#synthesize coordinateLabel;
#synthesize mapView;
#synthesize kmlParser;
CLLocationManager *_locationManager;
NSArray *_regionArray;
- (void)viewDidLoad
{
[super viewDidLoad];
[self initializeMap];
[self initializeLocationManager];
NSArray *geofences = [self buildGeofenceData];
[self initializeRegionMonitoring:geofences];
[self initializeLocationUpdates];
// Locate the path to the route.kml file in the application's bundle
// and parse it with the KMLParser.
NSString *path = [[NSBundle mainBundle] pathForResource:#"urbanPOIsthlm" ofType:#"kml"];
NSURL *url = [NSURL fileURLWithPath:path];
kmlParser = [[KMLParser alloc] initWithURL:url];
[kmlParser parseKML];
// Add all of the MKOverlay objects parsed from the KML file to the map.
NSArray *overlays = [kmlParser overlays];
[mapView addOverlays:overlays];
// Add all of the MKAnnotation objects parsed from the KML file to the map.
NSArray *annotations = [kmlParser points];
[mapView addAnnotations:annotations];
// Walk the list of overlays and annotations and create a MKMapRect that
// bounds all of them and store it into flyTo.
MKMapRect flyTo = MKMapRectNull;
for (id <MKOverlay> overlay in overlays) {
if (MKMapRectIsNull(flyTo)) {
flyTo = [overlay boundingMapRect];
} else {
flyTo = MKMapRectUnion(flyTo, [overlay boundingMapRect]);
}
}
for (id <MKAnnotation> annotation in annotations) {
MKMapPoint annotationPoint = MKMapPointForCoordinate(annotation.coordinate);
MKMapRect pointRect = MKMapRectMake(annotationPoint.x, annotationPoint.y, 0, 0);
if (MKMapRectIsNull(flyTo)) {
flyTo = pointRect;
} else {
flyTo = MKMapRectUnion(flyTo, pointRect);
}
}
// Position the map so that all overlays and annotations are visible on screen.
mapView.visibleMapRect = flyTo;
}
- (void)viewDidUnload
{
[self setCoordinateLabel:nil];
[self setMapView:nil];
//DERAS alltså KML!!!
[kmlParser release];
///
[super viewDidUnload];
}
/////Deras alltså KML!!!
#pragma mark MKMapViewDelegate
- (MKOverlayView *)mapView:(MKMapView *)mapView viewForOverlay:(id <MKOverlay>)overlay
{
return [kmlParser viewForOverlay:overlay];
}
- (MKAnnotationView *)mapView:(MKMapView *)mapView viewForAnnotation:(id <MKAnnotation>)annotation
{
return [kmlParser viewForAnnotation:annotation];
}
//////////
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
- (void)initializeMap {
CLLocationCoordinate2D initialCoordinate;
initialCoordinate.latitude = 59.3353733;
initialCoordinate.longitude = 18.0712647;
[self.mapView setRegion:MKCoordinateRegionMakeWithDistance(initialCoordinate, 400, 400) animated:YES];
self.mapView.centerCoordinate = initialCoordinate;
[self.mapView setUserTrackingMode:MKUserTrackingModeFollow animated:YES];
}
- (void)initializeLocationManager {
// Check to ensure location services are enabled
if(![CLLocationManager locationServicesEnabled]) {
[self showAlertWithMessage:#"You need to enable location services to use this app."];
return;
}
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
}
- (void) initializeRegionMonitoring:(NSArray*)geofences {
if (_locationManager == nil) {
[NSException raise:#"Location Manager Not Initialized" format:#"You must initialize location manager first."];
}
if(![CLLocationManager regionMonitoringAvailable]) {
[self showAlertWithMessage:#"This app requires region monitoring features which are unavailable on this device."];
return;
}
for(CLRegion *geofence in geofences) {
[_locationManager startMonitoringForRegion:geofence
desiredAccuracy:kCLLocationAccuracyBest];
}
}
- (NSArray*) buildGeofenceData {
NSString* plistPath = [[NSBundle mainBundle] pathForResource:#"regions" ofType:#"plist"];
_regionArray = [NSArray arrayWithContentsOfFile:plistPath];
NSMutableArray *geofences = [NSMutableArray array];
for(NSDictionary *regionDict in _regionArray) {
CLRegion *region = [self mapDictionaryToRegion:regionDict];
[geofences addObject:region];
}
return [NSArray arrayWithArray:geofences];
}
- (CLRegion*)mapDictionaryToRegion:(NSDictionary*)dictionary {
NSString *title = [dictionary valueForKey:#"title"];
CLLocationDegrees latitude = [[dictionary valueForKey:#"latitude"] doubleValue];
CLLocationDegrees longitude =[[dictionary valueForKey:#"longitude"] doubleValue];
CLLocationCoordinate2D centerCoordinate = CLLocationCoordinate2DMake(latitude, longitude);
//CLLocationDistance regionRadius = 50.000;
CLLocationDistance regionRadius = [[dictionary valueForKey:#"radius"] doubleValue]; //<--STOD DOUBLE ISTÄLLET
return [[CLRegion alloc] initCircularRegionWithCenter:centerCoordinate
radius:regionRadius
identifier:title];
}
- (void)initializeLocationUpdates {
[_locationManager startUpdatingLocation];
}
#pragma mark - Location Manager - Region Task Methods
- (void)locationManager:(CLLocationManager *)manager didEnterRegion:(CLRegion *)region{
NSLog(#"Entered Region - %#", region.identifier);
[self showRegionAlert:#"Entering Region" forRegion:region.identifier];
}
- (void)locationManager:(CLLocationManager *)manager didExitRegion:(CLRegion *)region {
NSLog(#"Exited Region - %#", region.identifier);
[self showRegionAlert:#"Exiting Region" forRegion:region.identifier];
}
- (void)locationManager:(CLLocationManager *)manager didStartMonitoringForRegion:(CLRegion *)region {
NSLog(#"Started monitoring %# region", region.identifier);
}
#pragma mark - Location Manager - Standard Task Methods
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
self.coordinateLabel.text = [NSString stringWithFormat:#"%f,%f",newLocation.coordinate.latitude, newLocation.coordinate.longitude];
}
#pragma mark - Alert Methods
- (void) showRegionAlert:(NSString *)alertText forRegion:(NSString *)regionIdentifier {
UIAlertView *message = [[UIAlertView alloc] initWithTitle:alertText
message:regionIdentifier
delegate:nil
cancelButtonTitle:#"OK"
otherButtonTitles:nil];
[message show];
}
- (void)showAlertWithMessage:(NSString*)alertText {
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Location Services Error"
message:alertText
delegate:self
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alertView show];
}
#end
Appdelegate.h
#import <UIKit/UIKit.h>
#class ViewController;
#interface AppDelegate : NSObject <UIApplicationDelegate> {
UIWindow *window;
ViewController *viewController;
}
#property (nonatomic, retain) IBOutlet UIWindow *window;
#property (nonatomic, retain) IBOutlet ViewController *viewController;
#end
Appdelegate.m
#import "AppDelegate.h"
#import "ViewController.h"
#implementation AppDelegate
//DERAS ALLTSÅ KML!!
#synthesize window;
#synthesize viewController;
//
//Deras alltså KML!!
#pragma mark -
#pragma mark Application lifecycle
//
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
// Override point for customization after application launch.
self.viewController = [[ViewController alloc] initWithNibName:#"ViewController" bundle:nil];
self.window.rootViewController = self.viewController;
[self.window makeKeyAndVisible];
//Deras alltså KML!!
[window addSubview:viewController.view];
//
return YES;
}
//Deras alltså KML!!!
- (void)dealloc {
[viewController release];
[window release];
[super dealloc];
}
//
#end