C# CLLocation类代码示例

        public static void UpdateLocation(GPSLocate ms, CLLocation newLocation)
        {
            ms.LblAltitude.Text = newLocation.Altitude.ToString () + " meters";
             ms.LblLongitude.Text = newLocation.Coordinate.Longitude.ToString () + "º";
             ms.LblLatitude.Text = newLocation.Coordinate.Latitude.ToString () + "º";
             ms.LblCourse.Text = newLocation.Course.ToString () + "º";
             ms.LblSpeed.Text = newLocation.Speed.ToString () + " meters/s";

             // get the distance from here to paris
             ms.LblDistanceToParis.Text = (newLocation.DistanceFrom(new CLLocation(48.857, 2.351)) / 1000).ToString() + " km";

             var x1 =Convert.ToDouble( "40.023408");
             var y1 =Convert.ToDouble( "40.643127");
             var x2 =Convert.ToDouble( "30.753657");
             var y2 = Convert.ToDouble("30.038635");
             var longdute =newLocation.Coordinate.Longitude;
             var latidute = newLocation.Coordinate.Latitude;

             ms.checkIt.Clicked+= (sender, e) => {

            if (longdute > x2 && longdute < x1 && latidute > y2 && latidute < y1)
               new UIAlertView("Ankara Dışındasın", "Konum : " + longdute + " " + latidute, null, "OK", null).Show();
            else
               new UIAlertView("Ankara İçerisindesin", "Konum : " + longdute + " " + latidute, null, "OK", null).Show();

             };
        }

 public override void UpdatedLocation (CLLocationManager manager, CLLocation newLocation, CLLocation oldLocation)
 {                
     _helper.Locations.Add (newLocation);
     
     if (_helper.LocationAdded != null)
         _helper.LocationAdded (_helper, new LocationEventArgs (newLocation));
 }

 public override void LocationsUpdated(CLLocationManager manager, CLLocation[] locations)
 {
     Task.Run (async () =>  {await AppDelegate.FlicService.RefreshPendingConnections();});
     foreach(var loc in locations) {
         Console.WriteLine(loc);
     }
 }

		public override bool FinishedLaunching (UIApplication app, NSDictionary options)
		{
			window = new UIWindow (UIScreen.MainScreen.Bounds);

			var what = new EntryElement ("What ?", "e.g. pizza", String.Empty);
			var where = new EntryElement ("Where ?", "here", String.Empty);

			var section = new Section ();
			if (CLLocationManager.LocationServicesEnabled) {
				lm = new CLLocationManager ();
				lm.LocationsUpdated += delegate (object sender, CLLocationsUpdatedEventArgs e) {
					lm.StopUpdatingLocation ();
					here = e.Locations [e.Locations.Length - 1];
					var coord = here.Coordinate;
					where.Value = String.Format ("{0:F4}, {1:F4}", coord.Longitude, coord.Latitude);
				};
				section.Add (new StringElement ("Get Current Location", delegate {
					lm.StartUpdatingLocation ();
				}));
			}

			section.Add (new StringElement ("Search...", async delegate {
				await SearchAsync (what.Value, where.Value);
			}));

			var root = new RootElement ("MapKit Search Sample") {
				new Section ("MapKit Search Sample") { what, where },
				section
			};
			window.RootViewController = new UINavigationController (new DialogViewController (root, true));
			window.MakeKeyAndVisible ();
			return true;
		}

        public static JsonArray GetPoiInformation(CLLocation userLocation, int numberOfPlaces)
        {
            if (userLocation == null)
                return null;

            var pois = new List<JsonObject> ();

            for (int i = 0; i < numberOfPlaces; i++)
            {
                var loc = GetRandomLatLonNearby (userLocation.Coordinate.Latitude, userLocation.Coordinate.Longitude);

                var p = new Dictionary<string, JsonValue>(){
                    { "id", i.ToString() },
                    { "name", "POI#" + i.ToString() },
                    { "description", "This is the description of POI#" + i.ToString() },
                    { "latitude", loc[0] },
                    { "longitude", loc[1] },
                    { "altitude", 100f }
                };

                pois.Add (new JsonObject (p.ToList()));
            }

            var vals = from p in pois select (JsonValue)p;

            return new JsonArray (vals);
        }

        public void LocationManagerDidUpdateToLocationFromLocation(CLLocationManager manager, CLLocation newLocation, CLLocation oldLocation)
        {
            // Ignore updates where nothing we care about changed
            if (oldLocation != null &&
                newLocation.Coordinate.longitude == oldLocation.Coordinate.longitude &&
                newLocation.Coordinate.latitude == oldLocation.Coordinate.latitude &&
                newLocation.HorizontalAccuracy == oldLocation.HorizontalAccuracy)
            {
                return;
            }

            // Load the HTML for displaying the Google map from a file and replace the
            // format placeholders with our location data
            NSError error;
            NSString htmlString = NSString.StringWithFormat(
                NSString.StringWithContentsOfFileEncodingError(
                NSBundle.MainBundle.PathForResourceOfType("HTMLFormatString", @"html"),
                NSStringEncoding.NSUTF8StringEncoding,out error),
                newLocation.Coordinate.latitude,
                newLocation.Coordinate.longitude,
                LatitudeRangeForLocation(newLocation),
                LongitudeRangeForLocation(newLocation));

            // Load the HTML in the WebView and set the labels
            this.webView.MainFrame.LoadHTMLStringBaseURL(htmlString, null);
            this.locationLabel.StringValue = NSString.StringWithFormat("%f, %f",
                                                                       newLocation.Coordinate.latitude, newLocation.Coordinate.longitude);
            this.accuracyLabel.StringValue = NSString.StringWithFormat("%f",
                                                                       newLocation.HorizontalAccuracy);
        }

        // constructor from CoreLocation location
        internal Geoposition(CLLocation location)
        {
            Coordinate = new Geocoordinate();
            if (location != null)
            {
                Coordinate.Point = new Geopoint(new BasicGeoposition() { Latitude = location.Coordinate.Latitude, Longitude = location.Coordinate.Longitude, Altitude = location.Altitude });

                Coordinate.Accuracy = location.HorizontalAccuracy;

                if (!double.IsNaN(location.VerticalAccuracy))
                {
                    Coordinate.AltitudeAccuracy = location.VerticalAccuracy;
                }
#if __IOS__ || __MAC__
                if (!double.IsNaN(location.Course) && location.Course != -1)
                {
                    Coordinate.Heading = location.Course;
                }

                if (!double.IsNaN(location.Speed) && location.Speed != -1)
                {
                    Coordinate.Speed = location.Speed;
                }
#endif
                Coordinate.Timestamp = InTheHand.DateTimeOffsetHelper.FromNSDate(location.Timestamp);
            }
        }

		public void QueryForRecords (CLLocation location, Action<List<CKRecord>> completionHandler)
		{
			var radiusInKilometers = NSNumber.FromFloat (5f);
			var predicate = NSPredicate.FromFormat ("distanceToLocation:fromLocation:(location, %@) < %f",
				                new NSObject[] { location, radiusInKilometers });

			var query = new CKQuery (ItemRecordType, predicate) {
               SortDescriptors = new [] { new NSSortDescriptor ("creationDate", false) }
			};

			var queryOperation = new CKQueryOperation (query) {
				DesiredKeys = new [] { NameField }
			};

			var results = new List<CKRecord> ();

			queryOperation.RecordFetched = (record) => results.Add (record);

			queryOperation.Completed = (cursor, error) => {
				if (error != null) {
					Console.WriteLine ("An error occured: {0}", error.Description);
					return;
				}

				DispatchQueue.MainQueue.DispatchAsync (() => completionHandler (results));
			};

			publicDatabase.AddOperation (queryOperation);
		}

 public static double LatitudeRangeForLocation(CLLocation aLocation)
 {
     const double M = 6367000.0;
     const double metersToLatitude = 1.0/((Math.PI/180.0d)*M);
     const double accuracyToWindowScale = 2.0;
     return aLocation.HorizontalAccuracy*metersToLatitude*accuracyToWindowScale;
 }

		/// <summary>
		/// Finds the nearest restaurant.
		/// </summary>
		/// <returns>The nearest restaurant.</returns>
		/// <param name="location">Location.</param>
		public async static Task<string> FindNearestRestaurantAsync(CLLocation location)
		{
			// Search for restaurants near our location.
			string restaurant = string.Empty;
			try
			{
				var searchRequest = new MKLocalSearchRequest
				{
					NaturalLanguageQuery = "food",
					Region = new MKCoordinateRegion(new CLLocationCoordinate2D(location.Coordinate.Latitude, location.Coordinate.Longitude), new MKCoordinateSpan(0.3f, 0.3f))
				};


				var localSearch = new MKLocalSearch(searchRequest);
				var localSearchResponse = await localSearch.StartAsync();
				if(localSearchResponse.MapItems != null && localSearchResponse.MapItems.Length > 0)
				{
					var mapItem = localSearchResponse.MapItems[0];
					restaurant = mapItem.Name;
				}
			}
			catch(Exception ex)
			{
				//Console.WriteLine("Error searching restaurants: " + ex);
			}
			return restaurant;
		}

		public override void ViewDidAppear (bool animated)
		{
			base.ViewDidAppear (animated);

			viewIsDisplayed = true;
			var region = LocationTriggerCreator.TargetRegion;
			if (region != null) {
				var centerLocation = new CLLocation (region.Center.Latitude, region.Center.Longitude);
				geocoder.ReverseGeocodeLocation (centerLocation, (placemarks, error) => {
					// The geocoder took too long, we're not on this view any more.
					if (!viewIsDisplayed)
						return;

					if (error != null) {
						DisplayError (error);
						return;
					}

					if (placemarks != null) {
						var mostLikelyPlacemark = placemarks.FirstOrDefault ();
						if (mostLikelyPlacemark != null) {
							CNMutablePostalAddress address = CreatePostalAddress (mostLikelyPlacemark);
							var addressFormatter = new CNPostalAddressFormatter ();
							string addressString = addressFormatter.GetStringFromPostalAddress (address);
							localizedAddress = addressString.Replace ("\n", ", ");
							var section = NSIndexSet.FromIndex (2);
							TableView.ReloadSections (section, UITableViewRowAnimation.Automatic);
						}
					}
				});
			}
			TableView.ReloadData ();
		}

		async partial void SaveRecord (MonoTouch.UIKit.UIButton sender)
		{
			if (nameTextField.Text.Length < 1) {
				nameTextField.ResignFirstResponder ();
				return;
			}

			var saveLocation = new CLLocation (pin.Coordinate.Latitude, pin.Coordinate.Longitude);
			var record = await CloudManager.AddRecordAsync (nameTextField.Text, saveLocation);

			if (record == null) {
				Console.WriteLine ("Error: null returned on save");
				return;
			}

			nameTextField.Text = string.Empty;
			nameTextField.ResignFirstResponder ();

			var alert = UIAlertController.Create ("CloudKitAtlas", "Saved record", UIAlertControllerStyle.Alert);
			alert.AddAction (UIAlertAction.Create ("OK", UIAlertActionStyle.Default, (act) => {
				DismissViewController (true, null);
			}));

			PresentViewController (alert, true, null);
		}

		public async Task<CKRecord> AddRecordAsync (string name, CLLocation location)
		{
			var newRecord = new CKRecord (ItemRecordType);
			newRecord [NameField] = (NSString)name;
			newRecord [LocationField] = location;

			return await publicDatabase.SaveRecordAsync (newRecord);
		}

		double latitudeRangeForLocation(CLLocation location)
		{
			const double M = 6367000.0; // approximate average meridional radius of curvature of earth
			const double metersToLatitude = 1.0 / ((Math.PI / 180.0) * M);
			const double accuracyToWindowScale = 2.0; 
			
			return location.HorizontalAccuracy * metersToLatitude * accuracyToWindowScale;
		}

		partial void QueryRecords (UIBarButtonItem sender)
		{
			var queryLocation = new CLLocation (pin.Coordinate.Latitude, pin.Coordinate.Longitude);

			CloudManager.QueryForRecords (queryLocation, records => {
				results = records;
				TableView.ReloadData ();
			});
		}