i am creating an application in which i want to get the current location of the user where he is and display it on the map and when the user reaches the destination location from current location the destination location should also be pointed in the map along the direction of travel.
In my xib i have added a button & on action(showDirectionsToHere) of button i have called map
I have added the following code in my appdelegate but it gives me an error:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation{
[manager stopUpdatingLocation];
printf("\n Latitude = " "\n Longitude = " " ",[NSString stringWithFormat:#"%.7f",newLocation.coordinate.latitude],[NSString stringWithFormat:#"%.7f",newLocation.coordinate.longitude]);
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
CLLocationManager *locationManager = [[[CLLocationManager alloc]init]autorelease];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
//[self.window addSubview:viewController.view];
[self.window makeKeyAndVisible];
return YES;
}
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
printf("\nerror");
}
- (IBAction)showDirectionsToHere {
CLLocationCoordinate2D currentLocation = [self getCurrentLocation]; // LINE 1
NSString* url = [NSString stringWithFormat: #"http://maps.google.com/maps?saddr=old\%20Location&daddr=%f,%f", newLocation.latitude, newLocation.longitude];//Line 2
}
in line 1 of action(showDirectionsHere) i get error of invalid initializer
in Line 2 i get error that newLocation undeclared.
Please help me
NSString* url = [NSString stringWithFormat: #"http://maps.google.com/maps?saddr=old\%20Location&daddr=%f,%f", currentLocation.latitude, currentLocation.longitude];
Can you post the code for getCurrentLocation so that we can see what it returns.
The variable newLocation is undeclared. I think you meant currentLocation in the function.
Related
I am developing an iPhone app which uses location services and runs in background.This app displays latitude and longitude exactly when it runs on IOS6.But if i run the same app on IOS7, sometimes it shows latitude and longitude exactly, sometimes -1 and -1. I'm not understanding this behaviour on IOS7. what may be the reason for this behaviour?
In order to simulate a location, select the iOS Simulator Debug -> Location menu option and select either one of the pre-defined locations or journeys (such as City Bicycle Ride), or Custom Location… to enter a specific latitude and longitude.
This code worked for me.
Creating the CLLocationManager Object
The next task is to implement the code to create an instance of the CLLocationManager class. Since this needs to occur when the view loads, an ideal location is in the view controller’s viewDidLoad method in the LocationViewController.m file:
- (void)viewDidLoad {
[super viewDidLoad];
_locationManager = [[CLLocationManager alloc] init];
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
_locationManager.delegate = self;
[_locationManager startUpdatingLocation];
_startLocation = nil;
}
Implementing the Action Method
-(void)resetDistance:(id)sender
{
_startLocation = nil;
}
Implementing the CLLocationManager Method
#pragma mark -
#pragma mark CLLocationManagerDelegate
-(void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
NSString *currentLatitude = [[NSString alloc]
initWithFormat:#"%+.6f",
newLocation.coordinate.latitude];
_latitude.text = currentLatitude;
NSString *currentLongitude = [[NSString alloc]
initWithFormat:#"%+.6f",
newLocation.coordinate.longitude];
_longitude.text = currentLongitude;
NSString *currentHorizontalAccuracy =
[[NSString alloc]
initWithFormat:#"%+.6f",
newLocation.horizontalAccuracy];
_horizontalAccuracy.text = currentHorizontalAccuracy;
NSString *currentAltitude = [[NSString alloc]
initWithFormat:#"%+.6f",
newLocation.altitude];
_altitude.text = currentAltitude;
NSString *currentVerticalAccuracy =
[[NSString alloc]
initWithFormat:#"%+.6f",
newLocation.verticalAccuracy];
_verticalAccuracy.text = currentVerticalAccuracy;
if (_startLocation == nil)
_startLocation = newLocation;
CLLocationDistance distanceBetween = [newLocation
distanceFromLocation:_startLocation];
NSString *tripString = [[NSString alloc]
initWithFormat:#"%f",
distanceBetween];
_distance.text = tripString;
}
In the End Try this method
Try this method to get continuous updated latitude and longitude
(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *location_updated = [locations lastObject];
NSLog(#"updated coordinate are %#",location_updated);
}
Use this method for getting location continuously use this method
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
location_updated = [locations lastObject];
NSLog(#"updated coordinate are %#",location_updated);
}
may be you are using this method
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
This method has been Deprecated in iOS 6.0
I all I wonder if anybody can help me once again? I have moved my location coding from my View controller into an NSObject. I have then called this from the App Delegate
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
//Updating Location
[Location sharedLocation];
//Timer for reloading the XML
recheckTimer = [NSTimer scheduledTimerWithTimeInterval:30 target:self selector:#selector(recheckLocation) userInfo:nil repeats:YES];
return YES:
}
I have set a timer for when I want this process ran again
-(void)recheckLocation
{
//Updating Location
[Location sharedLocation];
NSLog(#"Timer Triggered");
}
The only thing is when the timer triggers the sharedlocation does not get updated again?? Please can anybody help in advance? Many thanks, Jon.
#import "Location.h"
#implementation Location
#synthesize locationManager;
- (id)init {
self = [super init];
if(self) {
self.locationManager = [CLLocationManager new];
[self.locationManager setDelegate:self];
[self.locationManager setDistanceFilter:500];//Metres
[self.locationManager setHeadingFilter:90];
[self.locationManager startMonitoringSignificantLocationChanges];
}
return self;
}
+ (Location*)sharedLocation {
static Location* sharedLocation;
if(!sharedLocation) {
#synchronized(sharedLocation) {
sharedLocation = [Location new];
}
}
return sharedLocation;
}
//LOCATION CODING
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(#"didFailWithError' %#", error);
UIAlertView *errorAlert = [[UIAlertView alloc]initWithTitle:#"Error" message:#"Failed to Get Your Current Location" delegate:nil cancelButtonTitle:#"OK" otherButtonTitles:nil];
[errorAlert show];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(#"didUpdateToLocation: %#", newLocation);
CLLocation *currentLocation = newLocation;
if (currentLocation != nil) {
//Resolve Web Address
webAddressResolved = [NSString stringWithFormat:#"XZYYFASDFA%f,%f.xml", currentLocation.coordinate.latitude, currentLocation.coordinate.longitude];
NSLog(#"Address Resolved %#", webAddressResolved);
}
//Stop Location Manager
[locationManager stopMonitoringSignificantLocationChanges];
}
Well what yo defined here is a singleton of Location and the purpose of shared location does not seem to update the location as it says in the code comments
what the sharedInstance does is return a reference that is once initialized and is used the same everywhere in the whole code.It gives you the location instance in return, which you are not retrieving anywhere and using it.You just call it but not use it.
Define a method to update location and call it after getting the memory from the location using
Location *sharedLoc=[Location sharedLocation];
and call the method to update the location as
[sharedLoc updateLocation];
Location.h
-(void)updateLocation;
in Location .m
-(void)updateLocation
{
//Code for updation purpose
}
My ultimate goal is that i need to send lat and logitude to web server, every time when location changes.
I am using below code for sending lat and longitude of a device to a web server after every 2 minutes but it is not giving sometimes correct latitude and longitude as location changes.
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation
*)newLocation fromLocation:(CLLocation *)oldLocation
{
NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
NSLog(#"Location Age%#",[NSString stringWithFormat:#"%d",locationAge]);
if (locationAge > 5) return;
// test that the horizontal accuracy does not indicate an invalid measurement
if (newLocation.horizontalAccuracy < 0) return;
NSString *stringUrl;
// BOOL check = FALSE;
NSLog(#"Before condition condition");
if(bestEffortAtLocation == nil || bestEffortAtLocation.horizontalAccuracy > newLocation.horizontalAccuracy){
NSLog(#"condition");
self.bestEffortAtLocation = newLocation;
if (newLocation.horizontalAccuracy <= locmanager.desiredAccuracy) {
// we have a measurement that meets our requirements, so we can stop updating the location
// IMPORTANT!!! Minimize power usage by stopping the location manager as soon as possible.
[locmanager stopUpdatingLocation];
locmanager.delegate = nil;
}
//check = TRUE;
}
stringUrl = [NSString stringWithFormat:URLSAVELAT,stringUserId,[NSString stringWithFormat:#"%g",self.bestEffortAtLocation.coordinate.latitude],[NSString stringWithFormat:#"%g",self.bestEffortAtLocation.coordinate.longitude]];}
For location manager i am using below code
{
locmanager = [[CLLocationManager alloc] init];
[locmanager setDelegate:self];
locmanager.distanceFilter = 10.0;
//locmanager.distanceFilter = kCLDistanceFilterNone;
[locmanager setDesiredAccuracy:kCLLocationAccuracyBest];
[locmanager startUpdatingLocation];
}
Any,even small help would be appreciated, Thank u in advance
You should use the location update call backs from the API and use updateLocation method:
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
if([self.delegate conformsToProtocol:#protocol(CoreLocationControllerDelegate)]) {
[self.delegate locationUpdate:newLocation];
}
}
Then in the viewcontroller do this:
- (void)locationUpdate:(CLLocation *)location {
//DO WHATEVER YOU WANT HERE, INCLUDING SENDING TO SERVER
}
You also need to define two protocol methods, one of which is the locationUpdate:
#protocol CoreLocationControllerDelegate
#required
- (void)locationUpdate:(CLLocation *)location;
- (void)locationError:(NSError *)error;
#end
I would not recommend doing all that you do in the didUpdateLocation: method.
Hello im trying to get the latitude and longitude values where the the location of the user is
without having the map show up so basically it will run on the background. I guess i have to use the map kit but are there any examples?
If you don't want a map, you don't need MapKit. Just use CLLocationManager.
- (id) init {
if (self = [super init]) {
locationManager = [[CLLocationManager alloc] init];
[locationManager setDelegate:self];
[locationManager startUpdatingLocation];
}
return self;
}
- (void) locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)location fromLocation:(CLLocation *)oldLocation {
NSLog(#"lat:%f lon:%f", location.coordinate.latitude, location.coordinate.longitude);
}
I am new to iphone development.I am creating a map application.I have toolbar below the mapview with a button on it.On clicking the button it displays as an alert to load the current location.In my button click even i hava given code to find current location
-(IBAction) gosearch : (id) sender{
self.locationManager = [[[CLLocationManager alloc] init] autorelease];
self.locationManager.delegate = self;
[locationManager startUpdatingLocation];
}
For me it is not displaying the alert.What should i do?Please help me out. Thanks.
You need to have your controller class implement protocol CLLocationManagerDeligate. This will mean that it gets notified of errors or when the location is posted (for example – locationManager:didUpdateToLocation:fromLocation:)
Then you can pass on the long/lat and radius of view required to the MapView
Make sure for the alert view it looks like this-
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:#"Current Location" message:#"Show Current Location?" delegate:nil cancelButtonTitle:#"Cancel" otherButtonTitles:#"OK"];
[alert show];
and also
- (void)alertView:(UIAlertView *)alertView willDismissWithButtonIndex:(NSInteger)buttonIndex
{
if (buttonIndex != [alertView cancelButtonIndex])
{
map.showsuserlocation = YES;
}
}
I'm not sure I fully understand your questions but here's what I have done to use the location manager.
First, I declare a class that implements CLLocationManagerDelegate
#interface GPSComponent <CLLocationManagerDelegate> {
CLLocationManager *locationManager;
CLLocation *currentLocation;
}
Then, in the class I have:
- (id) init {
locationManager = [[CLLocationManager alloc] init];
// Provide the best possible accuracy (this is the default; just want to write some code).
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
// Must move at least 100 meters to get a new location update (default is get all notifications).
locationManager.distanceFilter = 100;
locationManager.delegate = self;
[locationManager startUpdatingLocation];
}
#pragma mark -
#pragma mark CLLocationManagerDelegate methods
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation {
// If you are about 400 miles south off the coast of Ghana, we might be ignoring your location information. We apologize.
// This is a lazy way to check for failure (in which case the struct is zeroed out).
if((fabs(newLocation.coordinate.latitude) > 0.001) || (fabs(newLocation.coordinate.longitude) > 0.001)) {
NSLog(#"Got location %f,%f", newLocation.coordinate.latitude, newLocation.coordinate.longitude);
if (currentLocation != nil) {
[currentLocation release];
}
currentLocation = newLocation;
[currentLocation retain];
}
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error {
NSLog(#"Location Manager error");
}
Then, to display a map with the user's location:
// Pull out the longitude and latitude and invoke google maps
- (IBAction)mapItButtonPressed {
NSString *url = [NSString stringWithFormat: #"http://maps.google.com/maps?q=%f,%f", (float)currentLocation.coordinate.latitude, (float)currentLocation.coordinate.longitude];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:url]];
}