i am getting current attitude and longitude of device and print it with nslog but now how will update these latttitude and longitude on map accordingly. here is my code please look at this.
- (void)viewDidLoad {
[super viewDidLoad];
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:-33.868
longitude:151.2086
zoom:12];
mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView_.settings.myLocationButton = YES;
self.view = mapView_;
mapView_.settings.compassButton = YES;
[self startStandardUpdates];
}
- (void)startStandardUpdates
{
// Create the location manager if this object does not
// already have one.
NSLog(#"startupdatelocation");
if (nil == _locationManager)
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
_locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
// Set a movement threshold for new events.
_locationManager.distanceFilter = 10; // meters
[self.locationManager startUpdatingLocation];
}
- (void)startSignificantChangeUpdates
{
// Create the location manager if this object does not
// already have one.
if (nil == _locationManager)
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
[self.locationManager startMonitoringSignificantLocationChanges];
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray *)locations {
// If it's a relatively recent event, turn off updates to save power.
CLLocation* location = [locations lastObject];
NSLog(#"location %#", location);
NSDate* eventDate = location.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if (abs(howRecent) < 15.0) {
// If the event is recent, do something with it.
NSLog(#"latitude %+.6f, longitude %+.6f\n",location.coordinate.latitude,
location.coordinate.longitude);
}
}
i am printing current latitude and longitude now how will i show this location on map also please help me in this situation.
Current device location should be requested from the iOS - https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/LocationAwarenessPG/CoreLocation/CoreLocation.html
than you could show the marker with device location on the map
UPDATED for iOS9: I am new to iOS, experimenting with CoreLocation to return latitude and longitude values. The following code never executes the log output
-(void)viewWillAppear:(BOOL)animated{
manager = [[CLLocationManager alloc]init];
manager.delegate = self;
manager.desiredAccuracy = kCLLocationAccuracyBest;
[manager startUpdatingLocation];
}
Here is my didUpdateToLocation function with is never reached
- (void)locationManager:(CLLocationManager *)manager
didUpdateLocations:(NSArray<CLLocation *> *)locations{
NSLog(#"Location: %#", locations);
CLLocation *currentLocation = locations.lastObject;
if (currentLocation != nil) {
float latitude = currentLocation.coordinate.latitude;
float longitude = currentLocation.coordinate.longitude;
NSLog(#"dLongitude : %f", longitude);
NSLog(#"dLatitude : %f", latitude);
}
else{ NSLog(#"ERROR");
}
}
CLLocationManager is asynchronous, You should get the latitude and longitude in the delegate method.
locationManager.delegate = self;
Then implement this delegate method:
- locationManager:didUpdateLocations:
1.first of all, you should use you should use a actual device instead of a simulator
2.implement CLLocationManagerDelegate in the interface,like
#interface XXXXX () <CLLocationManagerDelegate>
3.after
locationManager = [[CLLocationManager alloc] init];
add
locationManager.delegate = self;
4.implement the delegate method
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
for (CLLocation *location in locations) {
//you can get locations here
}
}
I am using Location Manager. Its acting very strange. I have these UILabels in place and I am looking for away to consistently update these UILabels when the coordinates change. This is what I have in place:
#implementation ViewController
{
CLLocationManager *locationManager;
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
locationManager = [[CLLocationManager alloc] init];
[locationManager requestWhenInUseAuthorization];
[locationManager requestAlwaysAuthorization];
currentLocation = nil;
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
[locationManager startUpdatingLocation];
}
and then this:
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *) newLocation
fromLocation:(CLLocation *)oldLocation
{
/*if (currentLocation == nil)
currentLocation = newLocation;
if (currentLocation != nil) {
Longitude = [NSString stringWithFormat:#"%.10f", currentLocation.coordinate.longitude];
Latitude = [NSString stringWithFormat:#"%.10f", currentLocation.coordinate.latitude];
LongitudeDouble = currentLocation.coordinate.longitude;
LatitudeDouble = currentLocation.coordinate.latitude;
}*/
currentLocation = newLocation;
Longitude = [NSString stringWithFormat:#"%.10f", currentLocation.coordinate.longitude];
Latitude = [NSString stringWithFormat:#"%.10f", currentLocation.coordinate.latitude];
LongitudeDouble = currentLocation.coordinate.longitude;
LatitudeDouble = currentLocation.coordinate.latitude;
Long.text = [NSString stringWithFormat:#"%.10f", LongitudeDouble];
Lat.text = [NSString stringWithFormat:#"%.10f", LatitudeDouble];
}
My issue is when I run the app is updates the labels sometimes, but after a bit, its stops and when I close the app and reopen it the labels do not update at all.
What Am I doing wrong?
May be you should add this line self.locationManager.distanceFilter = 0.1
And fix your code like this
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
[locationManager requestWhenInUseAuthorization];
[locationManager requestAlwaysAuthorization];
locationManager.delegate = self;
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
locationManager.distanceFilter = 0.1
[locationManager startUpdatingLocation];
}
- (void)viewDidAppear:(BOOL)animated
{
[super viewDidAppear:animated];
currentLocation = nil;
}
Try this
viewDidLoad:
locationManager =[[CLLocationManager alloc] init] ;
locationManager.delegate=self;
locationManager.desiredAccuracy=kCLLocationAccuracyBest;
[locationManager requestWhenInUseAuthorization];
[locationManager requestAlwaysAuthorization];
[locationManager startUpdatingLocation];
Info.plist:
NSLocationAlwaysUsageDescription
NSLocationWhenInUseUsageDescription
Then
-(void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error{
NSLog(#"failed to update location");
}
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{
CLLocation *currentLocation=[locations lastObject];
lat=currentLocation.coordinate.latitude;
lon=currentLocation.coordinate.longitude;
NSString *strLat=[NSString stringWithFormat:#"%f",lat];
NSString *strLon=[NSString stringWithFormat:#"%f",lon];
latitude_1=[[NSMutableString alloc] initWithString:strLat];
longitude_1=[[NSMutableString alloc] initWithString:strLon];
}
I am a iOS application developer. I am working with Location Manager.
For every 5 seconds I am capturing the latitude and longitude and storing the CLLocation object in array. The lat and long is not completely correct when I am trying to draw those location in Map.
My code is following below:
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations{//ios6&+
CLLocation *loc;
NSInteger objCount = [locations count];
if (objCount >= 1) {
loc = [locations objectAtIndex:objCount - 1];
NSArray *Arr_TotalTime = [Str_TotalTime componentsSeparatedByString:#":"];
[ArrayOfLocations addObject:loc];
}
}
Any one can please give me more info to get ACTUAL location (lat, long) from didupdatelocation method.
Any help will be highly appreciated.
Depending on how you set up your location manager, the accuracy will vary.
Try something like this:
Location Manager
_locationManager = [[CLLocationManager alloc] init];
_locationManager.delegate = self;
_locationManager.desiredAccuracy = kCLLocationAccuracyBestForNavigation;
_locationManager.activityType = CLActivityTypeAutomotiveNavigation;
_locationManager.distanceFilter = kCLDistanceFilterNone;
Method
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *newLocation = [locations lastObject];
NSDate *eventDate = newLocation.timestamp;
NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
if ((abs(howRecent) <= 5) && (newLocation.horizontalAccuracy > 0) && (newLocation.verticalAccuracy > 0) && (newLocation.horizontalAccuracy < 100) && (newLocation.verticalAccuracy < 100))
{
[ArrayOfLocations addObject:newLocation];
}
else
{
// received bad signal
}
}
You can use CoreLocation to get the longitude and latitude.
Include framework:
Click your project in navigator.
Click the plus button under "link binary with libraries"
Add Corelocation to your project.
Import the header file:
import
Declare CLLocationManager:
CLLocationManager *locationManager;
initialize locationManager:
- (void)viewDidLoad
{
locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters;
[locationManager startUpdatingLocation];
}
Then, use
float latitude = locationManager.location.coordinate.latitude;
float longitude = locationManager.location.coordinate.longitude;
This my code......
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
location_updated = [locations lastObject];
NSLog(#"updated coordinate are %#",location_updated);
latitude1 = location_updated.coordinate.latitude;
longitude1 = location_updated.coordinate.longitude;
self.lblLat.text = [NSString stringWithFormat:#"%f",latitude1];
self.lblLon.text = [NSString stringWithFormat:#"%f",longitude1];
NSString *str = [NSString stringWithFormat:#"https://maps.googleapis.com/maps/api/geocode/json?latlng=%f,%f&sensor=false",latitude1,longitude1];
url = [NSURL URLWithString:str];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
connection = [NSURLConnection connectionWithRequest:request delegate:self];
if (connection)
{
webData1 = [[NSMutableData alloc]init];
}
GMSMarker *marker = [[GMSMarker alloc] init];
marker.position = CLLocationCoordinate2DMake(latitude1,longitude1);
marker.title = formattedAddress;
marker.icon = [UIImage imageNamed:#"m2.png"];
marker.map = mapView_;
marker.draggable = YES;
}
This method is call multiple times which i don't want.....
While allocating your LocationManager object you can set the distanceFilter property of the LocationManager. Distance filter property is a CLLocationDistance value which can be set to notify the location manager about the distance moved in meters. You can set the distance filter as follows:
LocationManager *locationManger = [[CLLocationManager alloc] init];
locationManager.delegate = self;
locationManager.distanceFilter = 100.0; // Will notify the LocationManager every 100 meters
locationManager.desiredAccuracy = kCLLocationAccuracyBest;
The easiest way:
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray<CLLocation *> *)locations
{
[manager stopUpdatingLocation];
manager.delegate = nil;
//...... do something
}
The manager can't find your didUpdateLocations method without the delegate reference :-D
But don't forget to set it again before using startUpdatingLocation
Add some restriction there. For timespan between locations and accuracy
-(void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
CLLocation *newLocation = locations.lastObject;
NSTimeInterval locationAge = -[newLocation.timestamp timeIntervalSinceNow];
if (locationAge > 5.0) return;
if (newLocation.horizontalAccuracy < 0) return;
// Needed to filter cached and too old locations
//NSLog(#"Location updated to = %#", newLocation);
CLLocation *loc1 = [[CLLocation alloc] initWithLatitude:_currentLocation.coordinate.latitude longitude:_currentLocation.coordinate.longitude];
CLLocation *loc2 = [[CLLocation alloc] initWithLatitude:newLocation.coordinate.latitude longitude:newLocation.coordinate.longitude];
double distance = [loc1 distanceFromLocation:loc2];
if(distance > 20)
{
_currentLocation = newLocation;
//significant location update
}
//location updated
}
I have similar situation. You can use dispatch_once:
static dispatch_once_t predicate;
- (void)update
{
if ([CLLocationManager authorizationStatus] == kCLAuthorizationStatusNotDetermined &&
[_locationManager respondsToSelector:#selector(requestWhenInUseAuthorization)]) {
[_locationManager requestWhenInUseAuthorization];
}
_locationManager.delegate = self;
_locationManager.distanceFilter = kCLDistanceFilterNone;
_locationManager.desiredAccuracy = kCLLocationAccuracyBest;
predicate = 0;
[_locationManager startUpdatingLocation];
}
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {
[manager stopUpdatingLocation];
manager = nil;
dispatch_once(&predicate, ^{
//your code here
});
}
locationManager.startUpdatingLocation() fetch location continuously and didUpdateLocations method calls several times,
Just set the value for locationManager.distanceFilter value before calling locationManager.startUpdatingLocation().
As I set 200 meters(you can change as your requirement) working fine
locationManager = CLLocationManager()
locationManager.delegate = self
locationManager.desiredAccuracy = kCLLocationAccuracyBest
locationManager.distanceFilter = 200
locationManager.requestWhenInUseAuthorization()
locationManager.startUpdatingLocation()
You can use a static variable to store the latest location timestamp and then compare it to the newest one, like this:
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
[manager stopUpdatingLocation];
static NSDate *previousLocationTimestamp;
CLLocation *location = [locations lastObject];
if (previousLocationTimestamp && [location.timestamp timeIntervalSinceDate:previousLocationTimestamp] < 2.0) {
NSLog(#"didUpdateLocations GIVE UP");
return;
}
previousLocationTimestamp = location.timestamp;
NSLog(#"didUpdateLocations GOOD");
// Do your code here
}
Swift 5 :
If you are looking for a solution in swift.
I tried the accepted answer but it didn't work for me. I tried the below solution by checking the time duration between locations. if it is less than 10 seconds then it will return and the location handler will not update.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
guard let location = locations.last else {
return
}
let locationAge = -location.timestamp.timeIntervalSinceNow
if locationAge > 10.0 { //10 seconds
return
}
if location.horizontalAccuracy < 0 {
return
}
self.currentLocation = location
print("Location :- \(location.coordinate)")
//location updated
}
Write this method when ever you want to stop updating location manager
[locationManager stopUpdatingLocation];
for the time constraint, i did not understand code from accepted answer, posting a different approach. as Rob points out "When you first start location services, you may see it called multiple times". the code below acts on the first location, and ignores the updated locations for first 120 seconds. it is one way to address orginal question "How to stop multiple times method calling of didUpdateLocations".
in .h file:
#property(strong,nonatomic) CLLocation* firstLocation;
in .m file:
// is this the first location?
CLLocation* newLocation = locations.lastObject;
if (self.firstLocation) {
// app already has a location
NSTimeInterval locationAge = [newLocation.timestamp timeIntervalSinceDate:self.firstLocation.timestamp];
NSLog(#"locationAge: %f",locationAge);
if (locationAge < 120.0) { // 120 is in seconds or milliseconds?
return;
}
} else {
self.firstLocation = newLocation;
}
// do something with location
You could set a flag (Bool). When you instantiate your locationsManager set flag = true then when locationManager:didUpdateLocations returns inside a code block
that you want to run only once set flag = false. This way it will only be run the once.
if flag == true {
flag = false
...some code probably network call you only want to run the once
}
locations manager will be called multiple times but the code you want to execute only once, and I think that is what you are trying to achieve?
you can write :
[manager stopUpdatingLocation];
manager = nil;
in didupdatelocation delegate
A few things worked for me:
setting location manager nil while didUpdateLocations after calling manager.stopUpdatingLocation()
I will suggest setting the location manager to nil is not a good approach.because CLLocationManager sometimes give accurate location in 3-4 times.
What I will suggest change accuracy to kilometers that's worked for me
clLocationManager?.distanceFilter = 1000
clLocationManager?.desiredAccuracy = kCLLocationAccuracyKilometer