How to make Google Maps link with location data in iOS - ios

Question

I have the latitude & Longitude data of a location, how can I make it a Google Maps link, when the user clicks on share and choose option like email.
Here is the code that I use to get location data:
// Here is the .h file
#interface locate : UIViewController <CLLocationManagerDelegate,MKMapViewDelegate>
{
CGPoint gestureStartPoint;
CLLocationManager *locationManager;
CLLocation *startingPoint;
UILabel *latitudeLabel;
UILabel *longitudeLabel;
UILabel *altitudeLabel;
MKMapView *mapView;
}
#property (assign) CGPoint gestureStartPoint;
#property (nonatomic, retain) CLLocationManager *locationManager;
#property (nonatomic, retain) CLLocation *startingPoint;
#property (nonatomic, retain) IBOutlet UILabel *latitudeLabel;
#property (nonatomic, retain) IBOutlet UILabel *longitudeLabel;
#property (nonatomic, retain) IBOutlet UILabel *altitudeLabel;
#property (nonatomic, retain) IBOutlet MKMapView *mapView;
#end
// Here is the .m file
#import "locate.h"
#implementation locate
#synthesize gestureStartPoint,locationManager,startingPoint,latitudeLabel,longitudeLabel,altitudeLabel,mapView;
- (void)dealloc
{
[locationManager release];
[startingPoint release];
[latitudeLabel release];
[longitudeLabel release];
[altitudeLabel release];
[super dealloc];
}
- (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
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation {
if (startingPoint == nil)
self.startingPoint = newLocation;
NSString *latitudeString = [[NSString alloc] initWithFormat:#"%g\u00B0",
newLocation.coordinate.latitude];
latitudeLabel.text = latitudeString;
[latitudeString release];
NSString *longitudeString = [[NSString alloc] initWithFormat:#"%g\u00B0",
newLocation.coordinate.longitude];
longitudeLabel.text = longitudeString;
[longitudeString release];
NSString *altitudeString = [[NSString alloc] initWithFormat:#"%gm",
newLocation.altitude];
altitudeLabel.text = altitudeString;
[altitudeString release];
}
- (void)locationManager:(CLLocationManager *)manager
didFailWithError:(NSError *)error {
NSString *errorType = (error.code == kCLErrorDenied) ?
#"Access Denied" : #"Unknown Error";
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:#"Error getting Location"
message:errorType
delegate:nil
cancelButtonTitle:#"Okay"
otherButtonTitles:nil];
[alert show];
[alert release];
}
- (void)viewDidLoad
{
self.locationManager = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
mapView.delegate = self;
mapView.mapType = MKMapTypeStandard;
[super viewDidLoad];
}
- (void)viewDidUnload
{
self.locationManager = nil;
self.latitudeLabel = nil;
self.longitudeLabel = nil;
self.altitudeLabel = nil;
[super viewDidUnload];
// Release any retained subviews of the main view.
// e.g. self.myOutlet = nil;
}
#end
Now please someone help me on how can I use the location data to create Google Maps link?

Answer 1

NSString *urlString = [NSString stringWithFormat:#"http://maps.google.com/maps/geo?q=%#&output=csv",
[txtf_mapsearch.text stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
NSString *locationString = [NSString stringWithContentsOfURL:[NSURL URLWithString:urlString]];
NSArray *listItems = [locationString componentsSeparatedByString:#","];
double latitude = 0.0;
double longitude = 0.0;
if([listItems count] >= 4 && [[listItems objectAtIndex:0] isEqualToString:#"200"]) {
latitude = [[listItems objectAtIndex:2] doubleValue];
longitude = [[listItems objectAtIndex:3] doubleValue];
}
else {
//Show error
}
CLLocationCoordinate2D location;
location.latitude = latitude;
location.longitude = longitude;
return location;

Answer 2

You need this code.
NSString *googleMapsURLString = [NSString stringWithFormat:#"http://maps.google.com/maps?q=%1.6f,%1.6f",
newLocation.coordinate.latitude,
newLocation.coordinate.longitude];
linkMap.text = googleMapsURLString;

Answer 3

Try this
NSString *googleMapsURLString = [NSString stringWithFormat:#"http://maps.google.com/?saddr=%1.6f,%1.6f&daddr=%1.6f,%1.6f",
self.currentLocation.coordinate.latitude,
self.currentLocation.coordinate.longitude,
longitude,
latitude];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:googleMapsURLString]];
where latitude and longitude are the point of interest.