Merge pull request #1739 from leonluc-dev/LocationAccuracyHandling

Added support for reduced accuracy detection on iOS 14

Author: jfversluis

DeviceTests/DeviceTests.Shared/Geolocation_Tests.cs

@@ -69,11 +69,13 @@ await MainThread.InvokeOnMainThreadAsync(async () =>
             });
 
             var request = new GeolocationRequest(GeolocationAccuracy.Best);
+            request.RequestFullAccuracy = true;
             var location = await Geolocation.GetLocationAsync(request);
 
             Assert.NotNull(location);
 
             Assert.True(location.Accuracy > 0);
+            Assert.False(location.ReducedAccuracy);
             Assert.NotEqual(0.0, location.Latitude);
             Assert.NotEqual(0.0, location.Longitude);
 

Xamarin.Essentials/Geolocation/Geolocation.ios.macos.cs

@@ -19,7 +19,14 @@ static async Task<Location> PlatformLastKnownLocationAsync()
             var manager = new CLLocationManager();
             var location = manager.Location;
 
-            return location?.ToLocation();
+            var reducedAccuracy = false;
+#if __IOS__
+            if (Platform.HasOSVersion(14, 0))
+            {
+                reducedAccuracy = manager.AccuracyAuthorization == CLAccuracyAuthorization.ReducedAccuracy;
+            }
+#endif
+            return location?.ToLocation(reducedAccuracy);
         }
 
         static async Task<Location> PlatformLocationAsync(GeolocationRequest request, CancellationToken cancellationToken)
@@ -51,9 +58,22 @@ static async Task<Location> PlatformLocationAsync(GeolocationRequest request, Ca
 
             manager.StartUpdatingLocation();
 
+            var reducedAccuracy = false;
+#if __IOS__
+            if (Platform.HasOSVersion(14, 0))
+            {
+                if (request.RequestFullAccuracy && manager.AccuracyAuthorization == CLAccuracyAuthorization.ReducedAccuracy)
+                {
+                    await manager.RequestTemporaryFullAccuracyAuthorizationAsync("XamarinEssentialsFullAccuracyUsageDescription");
+                }
+
+                reducedAccuracy = manager.AccuracyAuthorization == CLAccuracyAuthorization.ReducedAccuracy;
+            }
+#endif
+
             var clLocation = await tcs.Task;
 
-            return clLocation?.ToLocation();
+            return clLocation?.ToLocation(reducedAccuracy);
 
             void HandleLocation(CLLocation location)
             {

Xamarin.Essentials/Geolocation/GeolocationRequest.shared.cs

@@ -57,6 +57,8 @@ public GeolocationRequest(GeolocationAccuracy accuracy, TimeSpan timeout)
 
         public GeolocationAccuracy DesiredAccuracy { get; set; }
 
+        public bool RequestFullAccuracy { get; set; }
+
         public override string ToString() =>
             $"{nameof(DesiredAccuracy)}: {DesiredAccuracy}, {nameof(Timeout)}: {Timeout}";
     }

Xamarin.Essentials/Types/Location.shared.cs

@@ -58,6 +58,7 @@ public Location(Location point)
             Altitude = point.Altitude;
             Accuracy = point.Accuracy;
             VerticalAccuracy = point.VerticalAccuracy;
+            ReducedAccuracy = point.ReducedAccuracy;
             Speed = point.Speed;
             Course = point.Course;
             IsFromMockProvider = point.IsFromMockProvider;
@@ -75,6 +76,8 @@ public Location(Location point)
 
         public double? VerticalAccuracy { get; set; }
 
+        public bool ReducedAccuracy { get; set; }
+
         public double? Speed { get; set; }
 
         public double? Course { get; set; }

Xamarin.Essentials/Types/LocationExtensions.android.cs

@@ -34,6 +34,7 @@ internal static Location ToLocation(this AndroidLocation location) =>
 #else
                     default(float?),
 #endif
+                ReducedAccuracy = false,
                 Course = location.HasBearing ? location.Bearing : default(double?),
                 Speed = location.HasSpeed ? location.Speed : default(double?),
 #pragma warning disable CS0618 // Type or member is obsolete

Xamarin.Essentials/Types/LocationExtensions.ios.tvos.watchos.macos.cs

@@ -18,20 +18,22 @@ internal static Location ToLocation(this CLPlacemark placemark) =>
                 Longitude = placemark.Location.Coordinate.Longitude,
                 Altitude = placemark.Location.Altitude,
                 AltitudeReferenceSystem = AltitudeReferenceSystem.Geoid,
-                Timestamp = DateTimeOffset.UtcNow
+                Timestamp = DateTimeOffset.UtcNow,
+                ReducedAccuracy = false,
             };
 
         internal static IEnumerable<Location> ToLocations(this IEnumerable<CLPlacemark> placemarks) =>
             placemarks?.Select(a => a.ToLocation());
 
-        internal static Location ToLocation(this CLLocation location) =>
+        internal static Location ToLocation(this CLLocation location, bool reducedAccuracy) =>
             new Location
             {
                 Latitude = location.Coordinate.Latitude,
                 Longitude = location.Coordinate.Longitude,
                 Altitude = location.VerticalAccuracy < 0 ? default(double?) : location.Altitude,
                 Accuracy = location.HorizontalAccuracy,
                 VerticalAccuracy = location.VerticalAccuracy,
+                ReducedAccuracy = reducedAccuracy,
                 Timestamp = location.Timestamp.ToDateTime(),
 #if __IOS__ || __WATCHOS__
                 Course = location.Course < 0 ? default(double?) : location.Course,

Xamarin.Essentials/Types/LocationExtensions.uwp.cs

@@ -34,6 +34,7 @@ internal static Location ToLocation(this Geoposition location) =>
                 Altitude = location.Coordinate.Point.Position.Altitude,
                 Accuracy = location.Coordinate.Accuracy,
                 VerticalAccuracy = location.Coordinate.AltitudeAccuracy,
+                ReducedAccuracy = false,
                 Speed = (!location.Coordinate.Speed.HasValue || double.IsNaN(location.Coordinate.Speed.Value)) ? default : location.Coordinate.Speed,
                 Course = (!location.Coordinate.Heading.HasValue || double.IsNaN(location.Coordinate.Heading.Value)) ? default : location.Coordinate.Heading,
                 IsFromMockProvider = false,
@@ -49,6 +50,7 @@ internal static Location ToLocation(this Geocoordinate coordinate) =>
                  Altitude = coordinate.Point.Position.Altitude,
                  Accuracy = coordinate.Accuracy,
                  VerticalAccuracy = coordinate.AltitudeAccuracy,
+                 ReducedAccuracy = false,
                  Speed = (!coordinate.Speed.HasValue || double.IsNaN(coordinate.Speed.Value)) ? default : coordinate.Speed,
                  Course = (!coordinate.Heading.HasValue || double.IsNaN(coordinate.Heading.Value)) ? default : coordinate.Heading,
                  AltitudeReferenceSystem = coordinate.Point.AltitudeReferenceSystem.ToEssentials()