Trouble finding location with iPhone in urban environments - iphone

We are developing an iPhone app and need to know the user's approximate location. We are using CoreLocation. We can do it ok in suburban environments, but in New York City - we're not able to get any longitude/latitude info.
We suspect it's cos GPS signals are weak among highrises... But shouldn't we still be able to get some approximate location info back?
Any ideas on what may cause/fix this? Thanks.
#import "RootViewController.h"
#import "SlickEatsAppDelegate.h"
#import "SlickEatsWelcomePage.h"
#import "XMLParserShowTodaysOffer.h"
#import "SlickEatsSplashScreen.h"
#implementation RootViewController
#synthesize locationManager,currentLocation,appDelegate;
#synthesize getStartedButton,splashLogoImageView,howItWorkImageView,workButton,infoView;
#synthesize xmlParserShowTodaysOffer;//activityIndicator
#pragma mark -
#pragma mark View lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
[self connectedToNetwork];
self.navigationController.navigationBar.hidden = TRUE;
if(locationManager == nil)
{
[[self locationManager] startUpdatingLocation];
}
//[self.view addSubview:SlickEatsView];
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem;
}
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
}
/*-(IBAction)getStartedButton_Clicked:(id)sender
{
activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
self.activityIndicator.frame = CGRectMake(135, 150, 40, 40);
[self.view addSubview:activityIndicator];
if (self.activityIndicator.isAnimating == NO)
{
[self.activityIndicator startAnimating];
}
/*if(locationManager == nil)
{
[[self locationManager] startUpdatingLocation];
}*/
/*SlickEatsWelcomePage *welcomePage = [[SlickEatsWelcomePage alloc]initWithNibName:#"SlickEatsWelcomePage" bundle:nil];
appDelegate = (SlickEatsAppDelegate *)[[UIApplication sharedApplication]delegate];
xmlParserShowTodaysOffer = [XMLParserShowTodaysOffer alloc];
xmlParserShowTodaysOffer.currentCity = appDelegate.myCurrentCity;
xmlParserShowTodaysOffer.currentLatitude = appDelegate.myCurrentLatitude;
xmlParserShowTodaysOffer.currentLongitude = appDelegate.myCurrentLongitude;
[xmlParserShowTodaysOffer initXMLParser];
[xmlParserShowTodaysOffer release];
[self.navigationController pushViewController:welcomePage animated:YES];
[welcomePage release];
[activityIndicator removeFromSuperview];
//[[UIApplication sharedApplication] openURL:[NSURL URLWithString:#"9763912503"]];
}*/
- (CLLocationManager *)locationManager {
locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = kCLDistanceFilterNone; // whenever we move
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters; // 100 m
[locationManager startUpdatingLocation];
return locationManager;
}
#pragma mark -
#pragma mark CLLocationManagerDelegate Methods
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
appDelegate = (SlickEatsAppDelegate *)[[UIApplication sharedApplication]delegate];
int degrees = newLocation.coordinate.latitude;
double decimal = fabs(newLocation.coordinate.latitude - degrees);
int minutes = decimal * 60;
double seconds = decimal * 3600 - minutes * 60;
NSString *lat = [NSString stringWithFormat:#"%d° %d' %1.4f\"",
degrees, minutes, seconds];
//latLabel.text = lat;
NSLog(#"Current..Latitude::%#",lat);
NSString *CurrentLatitude = [NSString stringWithFormat:#"%lf",newLocation.coordinate.latitude];
NSLog(#"Current..Latitude::%#",CurrentLatitude);
//self.myCurrentLatitude=lat;
degrees = newLocation.coordinate.longitude;
decimal = fabs(newLocation.coordinate.longitude - degrees);
minutes = decimal * 60;
seconds = decimal * 3600 - minutes * 60;
NSString *longt = [NSString stringWithFormat:#"%d° %d' %1.4f\"", degrees, minutes, seconds];
//longLabel.text = longt;
NSLog(#"Current..Longitude::%#",longt);
NSString *CurrentLongitude = [NSString stringWithFormat:#"%lf",newLocation.coordinate.longitude];
NSLog(#"Current..Longitude::%#",CurrentLongitude);
appDelegate.myCurrentLatitude = CurrentLatitude;
appDelegate.myCurrentLongitude = CurrentLongitude;
MKReverseGeocoder *geoCoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
geoCoder.delegate = self;
[geoCoder start];
}
// this delegate is called when the reverseGeocoder finds a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark
{
MKPlacemark * myPlacemark = placemark;
// with the placemark you can now retrieve the city name
NSString *city =[ myPlacemark.addressDictionary objectForKey:(NSString*) kABPersonAddressCityKey];
// NSString *city = (NSString *)[myPlacemark.locality length];
NSLog(#"Current Add::%#",city);
appDelegate.myCurrentCity = city;
//[self sendLocation];
}
// this delegate is called when the reversegeocoder fails to find a placemark
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
NSLog(#"reverseGeocoder:%# didFailWithError:%#", geocoder, error);
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"error%#",error);
switch([error code])
{
case kCLErrorNetwork: // general, network-related error
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"please check your network connection or that you are not in airplane mode" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
case kCLErrorDenied:{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"user has denied to use current Location " delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
default:
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"unknown network error" delegate:self cancelButtonTitle:#"Ok" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
break;
}
}
-(void)sendLocation
{
NSLog(#"in Send Location..");
SlickEatsWelcomePage *welcomePage = [[SlickEatsWelcomePage alloc]initWithNibName:#"SlickEatsWelcomePage" bundle:nil];
appDelegate = (SlickEatsAppDelegate *)[[UIApplication sharedApplication]delegate];
xmlParserShowTodaysOffer = [XMLParserShowTodaysOffer alloc];
xmlParserShowTodaysOffer.currentCity = appDelegate.myCurrentCity;
xmlParserShowTodaysOffer.currentLatitude = appDelegate.myCurrentLatitude;
xmlParserShowTodaysOffer.currentLongitude = appDelegate.myCurrentLongitude;
[xmlParserShowTodaysOffer initXMLParser];
[xmlParserShowTodaysOffer release];
[self.navigationController pushViewController:welcomePage animated:YES];
[welcomePage release];
//[locationManager release];
}
-(IBAction)workButton_clicked:(id)sender
{
/*activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
self.activityIndicator.frame = CGRectMake(135, 150, 40, 40);
[self.splashLogoImageView addSubview:activityIndicator];
if (self.activityIndicator.isAnimating == NO)
{
[self.activityIndicator startAnimating];
}*/
SlickEatsSplashScreen *intro = [[SlickEatsSplashScreen alloc]initWithNibName:#"SlickEatsSplashScreen" bundle:nil];
[self.navigationController pushViewController:intro animated:YES];
[intro release];
//[activityIndicator removeFromSuperview];
}
- (void)connectedToNetwork {
BOOL aflag= ([NSString stringWithContentsOfURL:[NSURL URLWithString:#"http://www.google.co.in/"]]!=NULL)?YES:NO;
if (!aflag) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:#"Sorry!....You are not connected to network "
delegate:self cancelButtonTitle:#"Exit" otherButtonTitles:nil];
[alert show];
[alert release];
}
}
/*
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
}
*/
/*
- (void)viewWillDisappear:(BOOL)animated {
[super viewWillDisappear:animated];
}
*/
/*
- (void)viewDidDisappear:(BOOL)animated {
[super viewDidDisappear:animated];
}
*/
/*
// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
*/
/*
// Override to support conditional editing of the table view.
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the specified item to be editable.
return YES;
}
*/
/*
// Override to support editing the table view.
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath {
if (editingStyle == UITableViewCellEditingStyleDelete) {
// Delete the row from the data source.
[tableView deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade];
}
else if (editingStyle == UITableViewCellEditingStyleInsert) {
// Create a new instance of the appropriate class, insert it into the array, and add a new row to the table view.
}
}
*/
/*
// Override to support rearranging the table view.
- (void)tableView:(UITableView *)tableView moveRowAtIndexPath:(NSIndexPath *)fromIndexPath toIndexPath:(NSIndexPath *)toIndexPath {
}
*/
/*
// Override to support conditional rearranging of the table view.
- (BOOL)tableView:(UITableView *)tableView canMoveRowAtIndexPath:(NSIndexPath *)indexPath {
// Return NO if you do not want the item to be re-orderable.
return YES;
}
*/
#pragma mark -
#pragma mark Memory management
- (void)didReceiveMemoryWarning {
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Relinquish ownership any cached data, images, etc that aren't in use.
}
- (void)viewDidUnload {
// Relinquish ownership of anything that can be recreated in viewDidLoad or on demand.
// For example: self.myOutlet = nil;
}
- (void)dealloc {
[super dealloc];
[workButton release];
[howItWorkImageView release];
[splashLogoImageView release];
[getStartedButton release];
[locationManager release];
}
#end

I suspect that you are requesting GPS-like accuracy when the GPS chip isn't getting any signals due to the high rise buildings:
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters; // 100 m
Try commenting out the above statement and test it out in the field -- see how accurate the coordinates that you get.

Do you have a data connection? I've heard that it's sometimes tough to get a connection at all in Manhattan on certain networks, due to both the buildings and an overloaded network. If you're not getting data, it's going to be tough to get a fix.

Related

(MKAnnotationView *) mapView: not firing on first view

-(MKAnnotationView *) mapView: is not firing on the first run of the view.
I load pins in from a JSON call. The pins load fine with all the information but the call out(*see code) and turning them purple.(done in the -(MKAnnotationView *) mapView2:) however when I leave that tab and go back to it then it gets called and all is well.
Why this in not OK? Because end-users will not know that the map pins have a call out with phone call capabilities if they only check once.
Progress Flow: it loads the map. Loads the Pins. Changes the pins to purple with the call out. Then Zooms to pins and current location. But on the first run it does not Change the pins with call out.
I have narrowed it down to -(MKAnnotationView *) mapView: not firing the first time on several tests however on one test it did fire but only was called on the second of two pins till the view was reloaded.
I am open to any suggestions to improve any of the code weather it pertains to this or not. I always love learning better ways to do what I have done. So feel free with your criticisms.
.h file
#class Reachability;
#interface LocationsViewController : UIViewController <MKMapViewDelegate,CLLocationManagerDelegate>
{
NSString *phone;
IBOutlet MKMapView *mapView;
CLLocationManager *locationManager;
NSURLConnection *theConnection;
Reachability* internetReachable;
Reachability* hostReachable;
}
#property(nonatomic, retain) IBOutlet MKMapView *mapView;
#property(nonatomic, retain)CLLocationManager *locationManager;
#property(nonatomic, retain) NSString *phone;
- (BOOL) connectedToNetwork;
- (void) mapPinsJSON;
#end
.m file
#implementation LocationsViewController
#synthesize mapView;
#synthesize locationManager;
#synthesize phone;
MapAnnotation *ann1;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
self.title = NSLocalizedString(#"Locations", #"Locations");
self.tabBarItem.image = [UIImage imageNamed:#"locations"];
}
return self;
}
- (void)dealloc
{
[super dealloc];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
//Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
MKCoordinateRegion region;
region.center.latitude = newLocation.coordinate.latitude;
region.center.longitude= newLocation.coordinate.longitude;
region.span.longitudeDelta=0.2;
region.span.latitudeDelta =0.2;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
NSTimer *myTimer;
myTimer = [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:#selector(countDown) userInfo:nil repeats:NO];
[self zoomMapViewToFitAnnotations:self.mapView animated:YES];
}
-(void)countDown{
[locationManager stopUpdatingLocation];
}
-(void)viewDidDisappear:(BOOL)animated
{
[locationManager stopUpdatingLocation];
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[mapView removeAnnotations:mapView.annotations];
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
if([self connectedToNetwork] != YES)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"OH NO!" message:#"To get the latest information you need a data or wi-fi connection" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
else
{
[self performSelectorInBackground:#selector(mapPinsJSON) withObject:nil];
}
}
- (void) mapPinsJSON{
NSString *urlString = [NSString stringWithFormat:#"http://www.mywebsite.com/api/newlocations25/json.json"];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error;
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
for(id key in json) {
id value = [json objectForKey:key];
NSString *titlePin = [value valueForKey:#"address"];
NSString *address = [value valueForKey:#"title"];
NSString *latitude = [value valueForKey:#"latitude"];
NSString *longitude = [value valueForKey:#"longitude"];
NSArray* foo = [address componentsSeparatedByString: #":"];
NSString* address2 = [foo objectAtIndex: 0];
phone = [foo objectAtIndex: 1];
double myLatitude = [latitude doubleValue];
double myLongitude = [longitude doubleValue];
MKCoordinateRegion location1;
location1.center.latitude =myLatitude;
location1.center.longitude= myLongitude;
location1.span.longitudeDelta=0.1;
location1.span.latitudeDelta =0.1;
ann1 =[[[MapAnnotation alloc] init] autorelease];
ann1.title=[NSString stringWithFormat:#"%#",titlePin];
ann1.subtitle=[NSString stringWithFormat:#"%#",address2];
ann1.phone=[NSString stringWithFormat:#"%#",phone];
ann1.coordinate= location1.center;
[mapView addAnnotation:ann1];
[phone retain];
}
}
-(MKAnnotationView *) mapView:(MKMapView *)mapView2 viewForAnnotation:(id<MKAnnotation>)annotation {
if (annotation == mapView2.userLocation) {
return nil;
}else{
MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"current"];
MyPin.pinColor = MKPinAnnotationColorPurple;
UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeInfoDark];
[advertButton setImage:[UIImage imageNamed:#"mapphone"] forState:UIControlStateNormal];
[advertButton addTarget:self action:#selector(button:) forControlEvents:UIControlEventTouchUpInside];
MyPin.rightCalloutAccessoryView = advertButton;
MyPin.draggable = NO;
MyPin.highlighted = YES;
MyPin.animatesDrop=TRUE;
MyPin.canShowCallout = YES;
return MyPin;
}
}
-(void)button:(id)sender {
UIButton *button = (UIButton *)sender;
MKPinAnnotationView *annotationView = (MKPinAnnotationView*)button.superview.superview;
MapAnnotation *mapAnnotation = annotationView.annotation;
UIDevice *device = [UIDevice currentDevice];
if ([[device model] isEqualToString:#"iPhone"] ) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:#"tel:%#",mapAnnotation.phone]]];
} else {
UIAlertView *Notpermitted=[[UIAlertView alloc] initWithTitle:mapAnnotation.phone message:#"Your device doesn't support this feature." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[Notpermitted show];
[Notpermitted release];
}
}
- (BOOL) connectedToNetwork
{
Reachability *r = [Reachability reachabilityWithHostName:#"www.google.com"];
NetworkStatus internetStatus = [r currentReachabilityStatus];
BOOL internet;
if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN)) {
internet = NO;
} else {
internet = YES;
}
return internet;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
#define MINIMUM_ZOOM_ARC 0.014 //approximately 1 miles (1 degree of arc ~= 69 miles)
#define ANNOTATION_REGION_PAD_FACTOR 1.15
#define MAX_DEGREES_ARC 360
- (void)zoomMapViewToFitAnnotations:(MKMapView *)mapView3 animated:(BOOL)animated
{
NSArray *annotations = mapView.annotations;
int count = [mapView.annotations count];
if ( count == 0) { return; } //bail if no annotations
//convert NSArray of id <MKAnnotation> into an MKCoordinateRegion that can be used to set the map size
//can't use NSArray with MKMapPoint because MKMapPoint is not an id
MKMapPoint points[count]; //C array of MKMapPoint struct
for( int i=0; i<count; i++ ) //load points C array by converting coordinates to points
{
CLLocationCoordinate2D coordinate = [(id <MKAnnotation>)[annotations objectAtIndex:i] coordinate];
points[i] = MKMapPointForCoordinate(coordinate);
}
//create MKMapRect from array of MKMapPoint
MKMapRect mapRect = [[MKPolygon polygonWithPoints:points count:count] boundingMapRect];
//convert MKCoordinateRegion from MKMapRect
MKCoordinateRegion region = MKCoordinateRegionForMapRect(mapRect);
//add padding so pins aren't scrunched on the edges
region.span.latitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
region.span.longitudeDelta *= ANNOTATION_REGION_PAD_FACTOR;
//but padding can't be bigger than the world
if( region.span.latitudeDelta > MAX_DEGREES_ARC ) { region.span.latitudeDelta = MAX_DEGREES_ARC; }
if( region.span.longitudeDelta > MAX_DEGREES_ARC ){ region.span.longitudeDelta = MAX_DEGREES_ARC; }
//and don't zoom in stupid-close on small samples
if( region.span.latitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.latitudeDelta = MINIMUM_ZOOM_ARC; }
if( region.span.longitudeDelta < MINIMUM_ZOOM_ARC ) { region.span.longitudeDelta = MINIMUM_ZOOM_ARC; }
//and if there is a sample of 1 we want the max zoom-in instead of max zoom-out
if( count == 1 )
{
region.span.latitudeDelta = MINIMUM_ZOOM_ARC;
region.span.longitudeDelta = MINIMUM_ZOOM_ARC;
}
[mapView3 setRegion:region animated:animated];
}
#end
Well I feel sheepish. Here is what fixed it for me.
- (void)viewDidLoad
{
[super viewDidLoad];
mapView.delegate = self;
}

UICGDirectionsDelegate function are not calling in iphone

i display route from start to end point in mapView in iphone and i done it.But after one day i open this project and it does not display route because UICGDirectionsDelegate functions are not called. I dont know why its happen kindly some body guide me about this problem.Many thanks and my sample code is here`
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
if (diretions.isInitialized) {
[self update];
}
routeOverlayView = [[UICRouteOverlayMapView alloc] initWithMapView:mapViews];
diretions = [UICGDirections sharedDirections];
diretions.delegate = self;
}
- (IBAction)backButton:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
- (void)update {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
UICGDirectionsOptions *options = [[UICGDirectionsOptions alloc] init];
options.travelMode = travelMode;
if (is_route) {
startPoint = [NSString stringWithFormat:#"%f,%f",APPDELEGATE.user_latitude,APPDELEGATE.user_longitude];
endPoint = [NSString stringWithFormat:#"%#,%#",routeObj.latitude,routeObj.longitude];
destination = poiObj.english_title;
}else {
startPoint = [NSString stringWithFormat:#"%f,%f",APPDELEGATE.user_latitude,APPDELEGATE.user_longitude];
endPoint = [NSString stringWithFormat:#"%# ,%#",poiObj.latitude,poiObj.longitude];
destination = routeObj.starting_poi_name;
}
[diretions loadWithStartPoint:startPoint endPoint:endPoint options:options];
}
- (void)moveToCurrentLocation:(id)sender {
[mapViews setCenterCoordinate:[mapViews.userLocation coordinate] animated:YES];
}
- (void)addPinAnnotation:(id)sender {
UICRouteAnnotation *pinAnnotation = [[UICRouteAnnotation alloc] initWithCoordinate:[mapViews centerCoordinate]
title:nil
annotationType:UICRouteAnnotationTypeWayPoint];
[mapViews addAnnotation:pinAnnotation];
}
#pragma mark <UICGDirectionsDelegate> Methods
- (void)directionsDidFinishInitialize:(UICGDirections *)directions {
[self update];
}
- (void)directions:(UICGDirections *)directions didFailInitializeWithError:(NSError *)error {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Map Directions" message:[error localizedFailureReason] delegate:nil cancelButtonTitle:nil otherButtonTitles:#"OK", nil];
[alertView show];
}
- (void)directionsDidUpdateDirections:(UICGDirections *)directions {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
// Overlay polylines
UICGPolyline *polyline = [directions polyline];
NSArray *routePoints = [polyline routePoints];
[routeOverlayView setRoutes:routePoints];
// Add annotations
currentLocation = #"You are here";
UICRouteAnnotation *startAnnotation = [[UICRouteAnnotation alloc] initWithCoordinate:[[routePoints objectAtIndex:0] coordinate]
title:currentLocation
annotationType:UICRouteAnnotationTypeStart];
UICRouteAnnotation *endAnnotation = [[UICRouteAnnotation alloc] initWithCoordinate:[[routePoints lastObject] coordinate]
title:destination
annotationType:UICRouteAnnotationTypeEnd];
[mapViews addAnnotations:[NSArray arrayWithObjects:startAnnotation, endAnnotation, nil]];
}
- (void)directions:(UICGDirections *)directions didFailWithMessage:(NSString *)message {
[[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Map Directions" message:message delegate:nil cancelButtonTitle:nil otherButtonTitles:#"OK", nil];
[alertView show];
}
`
In UICGRoute.m
Replace this
NSArray *stepDics;
NSDictionary *k;
for (int i = 0; i<allKeys.count; i++) {
k = [dictionaryRepresentation objectForKey:[allKeys objectAtIndex:i]];
if ([k objectForKey:#"Steps"]) {
stepDics = [k objectForKey:#"Steps"];
break;
}
}
with
NSDictionary *k = [dictionaryRepresentation objectForKey:[allKeys objectAtIndex:[allKeys count] - 1]];
NSArray *stepDics = [k objectForKey:#"Steps"];

How do I set map zoom based on nearest pin to current location

Right now I am setting my region based on users current location. I would like to now set the zoom level so I can see the users current location and the nearest pin that is being pulled in via json.
Not until run time will the app know the number of pins or the locations of said pins.
Here is what I have so far.
#implementation LocationsViewController
#synthesize mapView;
#synthesize locationManager;
#synthesize phone;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self)
{
self.title = NSLocalizedString(#"Locations", #"Locations");
self.tabBarItem.image = [UIImage imageNamed:#"locations"];
}
return self;
}
- (void)dealloc
{
[super dealloc];
[[NSNotificationCenter defaultCenter] removeObserver:self];
}
- (void)didReceiveMemoryWarning
{
// Releases the view if it doesn't have a superview.
[super didReceiveMemoryWarning];
// Release any cached data, images, etc that aren't in use.
}
#pragma mark - View lifecycle
//Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
[super viewDidLoad];
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"New latitude: %f", newLocation.coordinate.latitude);
NSLog(#"New longitude: %f", newLocation.coordinate.longitude);
MKCoordinateRegion region;
region.center.latitude =newLocation.coordinate.latitude;
region.center.longitude= newLocation.coordinate.longitude;
region.span.longitudeDelta=0.2;
region.span.latitudeDelta =0.2;
[mapView setRegion:region animated:YES];
[mapView setDelegate:self];
//[locationManager stopUpdatingLocation];
}
-(void)viewDidDisappear:(BOOL)animated
{
[locationManager stopUpdatingLocation];
}
-(void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
[locationManager startUpdatingLocation];
if([self connectedToNetwork] != YES)
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"OH NO!" message:#"To get the latest information you need a data or wi-fi connection" delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil, nil];
[alert show];
[alert release];
}
else
{
[mapView removeAnnotations:mapView.annotations];
NSString *urlString = [NSString stringWithFormat:#"http://www.mywebsite.com/json.json"];
NSURL *url = [NSURL URLWithString:urlString];
NSData *data = [NSData dataWithContentsOfURL:url];
NSError *error;
NSMutableDictionary *json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:&error];
for(id key in json) {
id value = [json objectForKey:key];
NSString *titlePin = [value valueForKey:#"address"];
NSString *address = [value valueForKey:#"title"];
NSString *latitude = [value valueForKey:#"latitude"];
NSString *longitude = [value valueForKey:#"longitude"];
NSArray* foo = [address componentsSeparatedByString: #":"];
NSString* address2 = [foo objectAtIndex: 0];
phone = [foo objectAtIndex: 1];
double myLatitude = [latitude doubleValue];
double myLongitude = [longitude doubleValue];
MKCoordinateRegion location1;
location1.center.latitude =myLatitude;
location1.center.longitude= myLongitude;
location1.span.longitudeDelta=0.1;
location1.span.latitudeDelta =0.1;
MapAnnotation *ann1 =[[[MapAnnotation alloc] init] autorelease];
ann1.title=[NSString stringWithFormat:#"%#",titlePin];
ann1.subtitle=[NSString stringWithFormat:#"%#",address2];
ann1.phone=[NSString stringWithFormat:#"%#",phone];
ann1.coordinate= location1.center;
[mapView addAnnotation:ann1];
[phone retain];
}
}
}
-(MKAnnotationView *) mapView:(MKMapView *)mapView2 viewForAnnotation:(id<MKAnnotation>)annotation {
if (annotation == mapView2.userLocation) {
return nil;
}else{
MKPinAnnotationView *MyPin=[[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:#"current"];
MyPin.pinColor = MKPinAnnotationColorPurple;
UIButton *advertButton = [UIButton buttonWithType:UIButtonTypeInfoDark];
[advertButton setImage:[UIImage imageNamed:#"mapphone"] forState:UIControlStateNormal];
[advertButton addTarget:self action:#selector(button:) forControlEvents:UIControlEventTouchUpInside];
MyPin.rightCalloutAccessoryView = advertButton;
MyPin.draggable = NO;
MyPin.highlighted = YES;
MyPin.animatesDrop=TRUE;
MyPin.canShowCallout = YES;
return MyPin;
}
}
-(void)button:(id)sender {
UIButton *button = (UIButton *)sender;
MKPinAnnotationView *annotationView = (MKPinAnnotationView*)button.superview.superview;
MapAnnotation *mapAnnotation = annotationView.annotation;
UIDevice *device = [UIDevice currentDevice];
if ([[device model] isEqualToString:#"iPhone"] ) {
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[NSString stringWithFormat:#"tel:%#",mapAnnotation.phone]]];
} else {
UIAlertView *Notpermitted=[[UIAlertView alloc] initWithTitle:mapAnnotation.phone message:#"Your device doesn't support this feature." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[Notpermitted show];
[Notpermitted release];
}
}
- (BOOL) connectedToNetwork
{
Reachability *r = [Reachability reachabilityWithHostName:#"www.google.com"];
NetworkStatus internetStatus = [r currentReachabilityStatus];
BOOL internet;
if ((internetStatus != ReachableViaWiFi) && (internetStatus != ReachableViaWWAN)) {
internet = NO;
} else {
internet = YES;
}
return internet;
}
- (void)viewDidUnload
{
[super viewDidUnload];
// e.g. self.myOutlet = nil;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return YES;
}
#end
I did something similar, but based on two annotations, not the user's location. You should be able to replace mapView.centerCoordinate with mapView.userLocation.coordinate.
in viewForAnnotation:
CLLocation *centerLoc = [[CLLocation alloc] initWithLatitude:mapView.centerCoordinate.latitude longitude:mapView.centerCoordinate.longitude];
CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:[annotation coordinate].latitude longitude:[annotation coordinate].longitude];
CLLocationDistance distance = [loc2 distanceFromLocation:centerLoc];
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(mapView.centerCoordinate, distance*2, distance*2);
MKCoordinateRegion adjustedRegion = [mapView regionThatFits:viewRegion];
[mapView setRegion:adjustedRegion animated:YES];
Note, this code will re-calc the zoom level each time you add an annotation. You may need to save the distance and only change the map if the new distance is greater than the prior distance.

Can't extracts information from RSS - Xcode

I built an app, and i left the Rss for the end, when i built it, everything works, except i can't see the information from the rss, i can see the title in the table view, but i can't see the image, Title, and description.
Please help me with this,
Thank From advance,
John
(The Application is based on : View Based Application !)
also, i attach my code :
-(void)reloadRss{
[self toggleToolBarButtons:NO];
[[self rssParser]startProcess];
}
-(void)toggleToolBarButtons:(BOOL)newState{
NSArray *toolbarItems = self.toolbar.items;
for (UIBarButtonItem *item in toolbarItems){
item.enabled = newState;
}
}
//Delegate method for blog parser will get fired when the process is completed
- (void)processCompleted{
//reload the table view
[self toggleToolBarButtons:YES];
[[self tableView]reloadData];
}
-(void)processHasErrors{
//Might be due to Internet
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"The" message:#"איןאפשרות להוריד מידע. אנאבדוק את חיבור האינטרנט שלך." delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[alert show];
[alert release];
[self toggleToolBarButtons:YES];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
return [[[self rssParser]rssItems]count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"rssItemCell"];
if(nil == cell){
cell = [[[UITableViewCell alloc]initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:#"rssItemCell"]autorelease];
}
cell.textLabel.text = [[[[self rssParser]rssItems]objectAtIndex:indexPath.row]title];
cell.detailTextLabel.text = [[[[self rssParser]rssItems]objectAtIndex:indexPath.row]description];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
[[self viewController] setCurrentlySelectedBlogItem:[[[self rssParser]rssItems]objectAtIndex:indexPath.row]];
[self.view addSubview:newsr];
}
-(IBAction)rss{
[self.view addSubview:rss];
}
- (void)viewDidUnload {
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil; }
-(BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationPortrait); }
-(void)openWebLink{ // open a dialog with an OK and cancel button
UIActionSheet *actionSheet = [[UIActionSheet alloc]initWithTitle:#"האם אתה רוצה לפתוח דף זה ב-Safari ?" delegate:self cancelButtonTitle:#"בטל" destructiveButtonTitle:#"אשר" otherButtonTitles:nil];
actionSheet.actionSheetStyle = UIActionSheetStyleDefault;
[actionSheet showFromToolbar:_toolbar];
[actionSheet release];
}
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex{
if(buttonIndex == 0){
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:[[[self viewController] currentlySelectedBlogItem]linkUrl]]];
}
}
- (void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
NSString * mediaUrl = [[[self viewController]currentlySelectedBlogItem]mediaUrl];
[[self image]setImage:[UIImage imageNamed:#"unknown.jpg"]];
if(nil != mediaUrl){
NSData* imageData;
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
#try {
imageData = [[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:mediaUrl]];
}
#catch (NSException * e) {
//Some error while downloading data
}
#finally {
UIImage * imageFromImageData = [[UIImage alloc] initWithData:imageData];
[[self image]setImage:imageFromImageData];
[imageData release];
[imageFromImageData release];
}
[UIApplication sharedApplication].networkActivityIndicatorVisible = YES;
}
self.titleTextView.text = [[[self viewController] currentlySelectedBlogItem]title];
self.descriptionTextView.text = [[[self viewController] currentlySelectedBlogItem]description];
}
#end
Try to decode the content of the RSS with something like:
NSWindowsCP1252StringEncoding
NSUTF8StringEncoding
...

iPhone using geocoder to create a string so it can be fed into Google Maps

So here's my last query. I've got all my components I need, however, I need the phone to create a string from the geocoder so it can be fed into Google maps. This string is passed to a server, then grabbed from that database into another iPhone by different users. I have the database get/post side finished, but I need the geocoding to work so it can produce an address string. Here's my code: I've used Mark/LaMarche's mapkit tutorial as my foundation. My question is: Can I use the geocoder WITHOUT having to use MapKit? And would that save me more code than what is written below? Thank you!
- (IBAction)findMe {
CLLocationManager *lm = [[CLLocationManager alloc] init];
lm.delegate = self;
lm.desiredAccuracy = kCLLocationAccuracyBest;
[lm startUpdatingLocation];
progressBar.hidden = NO;
progressBar.progress = 0.0;
progressLabel.text = NSLocalizedString(#"Determining Current Location", #"Determining Current Location");
button.hidden = YES;
}
- (void)openCallout:(id<MKAnnotation>)annotation {
progressBar.progress = 1.0;
progressLabel.text = NSLocalizedString(#"Showing Annotation",#"Showing Annotation");
[mapView selectAnnotation:annotation animated:YES];
}
#pragma mark -
- (void)viewDidLoad {
mapView.mapType = MKMapTypeStandard;
// mapView.mapType = MKMapTypeSatellite;
// mapView.mapType = MKMapTypeHybrid;
}
- (void)viewDidUnload {
self.mapView = nil;
self.progressBar = nil;
self.progressLabel = nil;
self.button = nil;
}
- (void)dealloc {
[mapView release];
[progressBar release];
[progressLabel release];
[button release];
[address release];
[super dealloc];
}
#pragma mark -
#pragma mark CLLocationManagerDelegate Methods
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
if ([newLocation.timestamp timeIntervalSince1970] < [NSDate timeIntervalSinceReferenceDate] - 60)
return;
MKCoordinateRegion viewRegion = MKCoordinateRegionMakeWithDistance(newLocation.coordinate, 2000, 2000);
MKCoordinateRegion adjustedRegion = [mapView regionThatFits:viewRegion];
[mapView setRegion:adjustedRegion animated:YES];
manager.delegate = nil;
[manager stopUpdatingLocation];
[manager autorelease];
progressBar.progress = .25;
progressLabel.text = NSLocalizedString(#"Reverse Geocoding Location", #"Reverse Geocoding Location");
MKReverseGeocoder *geocoder = [[MKReverseGeocoder alloc] initWithCoordinate:newLocation.coordinate];
geocoder.delegate = self;
[geocoder start];
}
- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error {
NSString *errorType = (error.code == kCLErrorDenied) ?
NSLocalizedString(#"Access Denied", #"Access Denied") :
NSLocalizedString(#"Unknown Error", #"Unknown Error");
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:NSLocalizedString(#"Error getting Location", #"Error getting Location")
message:errorType
delegate:self
cancelButtonTitle:NSLocalizedString(#"Okay", #"Okay")
otherButtonTitles:nil];
[alert show];
[alert release];
[manager release];
}
#pragma mark -
#pragma mark Alert View Delegate Methods
- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {
progressBar.hidden = YES;
progressLabel.text = #"";
}
#pragma mark -
#pragma mark Reverse Geocoder Delegate Methods
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFailWithError:(NSError *)error
{
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:NSLocalizedString(#"Error translating coordinates into location", #"Error translating coordinates into location")
message:NSLocalizedString(#"Geocoder did not recognize coordinates", #"Geocoder did not recognize coordinates")
delegate:self
cancelButtonTitle:NSLocalizedString(#"Okay", #"Okay")
otherButtonTitles:nil];
[alert show];
[alert release];
geocoder.delegate = nil;
[geocoder autorelease];
}
- (void)reverseGeocoder:(MKReverseGeocoder *)geocoder didFindPlacemark:(MKPlacemark *)placemark {
progressBar.progress = 0.5;
progressLabel.text = NSLocalizedString(#"Location Determined", #"Location Determined");
MapLocation *annotation = [[MapLocation alloc] init];
annotation.streetAddress = placemark.thoroughfare;
annotation.city = placemark.locality;
annotation.state = placemark.administrativeArea;
annotation.zip = placemark.postalCode;
annotation.coordinate = geocoder.coordinate;
NSString *firstTwo = [placemark.thoroughfare stringByAppendingFormat:#" %#",placemark.locality];
NSString *firstThree = [firstTwo stringByAppendingFormat:#", %#",placemark.administrativeArea];
NSString *makeAddress = [firstThree stringByAppendingFormat:#", %#",placemark.postalCode];
address = makeAddress;
NSLog(#"%#", address);
[mapView addAnnotation:annotation];
[annotation release];
geocoder.delegate = nil;
[geocoder autorelease];
}
#pragma mark -
#pragma mark Map View Delegate Methods
- (MKAnnotationView *) mapView:(MKMapView *)theMapView viewForAnnotation:(id <MKAnnotation>) annotation {
static NSString *placemarkIdentifier = #"Map Location Identifier";
if ([annotation isKindOfClass:[MapLocation class]]) {
MKPinAnnotationView *annotationView = (MKPinAnnotationView *)[theMapView dequeueReusableAnnotationViewWithIdentifier:placemarkIdentifier];
if (annotationView == nil) {
annotationView = [[MKPinAnnotationView alloc] initWithAnnotation:annotation reuseIdentifier:placemarkIdentifier];
}
else
annotationView.annotation = annotation;
annotationView.enabled = YES;
annotationView.animatesDrop = YES;
annotationView.pinColor = MKPinAnnotationColorPurple;
annotationView.canShowCallout = YES;
[self performSelector:#selector(openCallout:) withObject:annotation afterDelay:0.5];
progressBar.progress = 0.75;
progressLabel.text = NSLocalizedString(#"Creating Annotation",#"Creating Annotation");
return annotationView;
}
return nil;
}
- (void)mapViewDidFailLoadingMap:(MKMapView *)theMapView withError:(NSError *)error {
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:NSLocalizedString(#"Error loading map", #"Error loading map")
message:[error localizedDescription]
delegate:nil
cancelButtonTitle:NSLocalizedString(#"Okay", #"Okay")
otherButtonTitles:nil];
[alert show];
[alert release];
}
I'm assuming when you say "Geocoder", you actually mean the MKReverseGeocoder class. The Reverse Geocoder is part of the Mapkit framework, so in order to use it, you must include it to the file in which you are using it. However, you do not need to add an actual MapView or anything, you can just get the information that the reverse geocoder gives you and pass it on to your server however you want. I hope this answers your question.