Get GPS Location in IOS 8 using XAMARIN - ios

Question

i am new to Xamarin, i have a code to get GPS location, which is working fine for IOS 6 but for IOS 8 it is not fetching the long. and lat.
//Check for getting current lat/long
CLLocationCoordinate2D toLocation;
private CLLocationManager locationManager;
if (!CLLocationManager.LocationServicesEnabled) {
AppDelegate.currLat = "";
AppDelegate.currLong = "";
gpsFlag = false;
} else {
gpsFlag = true;
locationManager = new CLLocationManager();
locationManager.StartUpdatingLocation();
if (locationManager.Location != null) {
toLocation = locationManager.Location.Coordinate;
AppDelegate.currLat = Convert.ToString (toLocation.Latitude);
AppDelegate.currLong = Convert.ToString (toLocation.Longitude);
}
locationManager.StopUpdatingLocation ();
}
i am using the Universal Template to create Application in Xamarin. i have R&D for IOS 8 GPS location, i got to know that i need to add "NSLocationAlwaysUsageDescription" to info.plist, but i am not getting how to add this.
getting-gps-location-using-core-location-in-ios-8
Please help me how can get the GPS location for IOS 8

Answer 1

public class LocationHelper
{
private static bool _isTracking;
public static bool IsTracking { get { return _isTracking; } }
private static string _longitude;
private static string _latitude;
private static DateTime _lastUpdated;
public static event EventHandler LocationUpdated;
public static CLLocationManager LocationManager { private set; get; }
public static void StartLocationManager(double distanceFilter, double accuracy)
{
LocationManager = new CLLocationManager();
if (LocationManager.RespondsToSelector(new MonoTouch.ObjCRuntime.Selector("requestWhenInUseAuthorization")))
LocationManager.RequestWhenInUseAuthorization();
LocationManager.DistanceFilter = CLLocationDistance.FilterNone;
LocationManager.DesiredAccuracy = accuracy;
LocationManager.LocationsUpdated += LocationManager_LocationsUpdated;
LocationManager.StartUpdatingLocation();
_isTracking = true;
System.Diagnostics.Debug.WriteLine("Location manager started ");
}
public static void StopLocationManager()
{
if (LocationManager != null)
{
LocationManager.LocationsUpdated -= LocationManager_LocationsUpdated;
LocationManager = null;
_isTracking = false;
}
}
public static void Refresh()
{
LocationManager.StopUpdatingLocation();
LocationManager.StartUpdatingLocation();
}
private static void LocationManager_LocationsUpdated(object sender, CLLocationsUpdatedEventArgs e)
{
if (LocationUpdated != null)
LocationUpdated(null, null);
UpdateLocation(e.Locations[e.Locations.Length - 1]);
}
private static void UpdateLocation(CLLocation location)
{
_longitude = location.Coordinate.Longitude.ToString();
_latitude = location.Coordinate.Latitude.ToString();
_lastUpdated = DateTime.Now;
}
public static LocationResult GetLocationResult()
{
return new LocationResult(_latitude, _longitude, _lastUpdated);
}
public class LocationResult
{
public DateTime UpdatedTime { private set; get; }
public string Latitude { private set; get; }
public string Longitude { private set; get; }
public LocationResult(string latitude, string longitude, DateTime updated)
{
UpdatedTime = updated;
Latitude = latitude;
Longitude = longitude;
}
}
}
This works in iOS8I'm using this static class, every time before taking coordinates I'm calling Refresh() I'm cant find thread where i found this solution but this causes to return location immediately, and then call to GetLocationResult() to get location and when u finished with locationManager call StopLocationManager()

Answer 2

When you create a new instance of CLLocationmanager it is extremely important that you call the following:
manager = new CLLocationManager();
1.) manager.RequestWhenInUseAuthorization (); //This is used if you are doing anything in the foreground.
2.) manager.RequestAlwaysAuthorization ();// This is used if you want to scan in the background
Of course these are iOS 8 only methods so makes sure to do a version check with: UIDevice.CurrentDevice.CheckSystemVersion (8, 0);
This isn’t enough though to prompt your user for access to location. You will need to now modify your Info.plist! You will need to add a new string entry called NSLocationWhenInUseUsageDescription or NSLocationAlwaysUsageDescription. Then you can specify the message you want to prompt your user with when attempting to get location