fix!: iOS create instance only if motion is available

src/Uno.UWP/Devices/Sensors/SimpleOrientationSensor.cs

@@ -8,17 +8,31 @@ public partial class SimpleOrientationSensor
 		#region Static
 
 		private static SimpleOrientationSensor _instance;
+		private static bool _initialized;
+		private readonly static object _syncLock = new();
 
 		public static SimpleOrientationSensor GetDefault()
 		{
-			if (_instance == null)
+			if (_initialized)
 			{
-				_instance = new SimpleOrientationSensor();
+				return _instance;
 			}
 
-			return _instance;
+			lock (_syncLock)
+			{
+				if (!_initialized)
+				{
+					_instance = TryCreateInstance();
+					_initialized = true;
+				}
+
+				return _instance;
+			}
 		}
 
+		private static partial SimpleOrientationSensor TryCreateInstance();
+
+
 		#endregion
 
 #pragma warning disable CS0649 // Field 'SimpleOrientationSensor._currentOrientation' is never assigned to, and will always have its default value - Assigned only in Android and iOS.

src/Uno.UWP/Devices/Sensors/SimpleOrientationSensor.iOS.cs

@@ -1,4 +1,4 @@
-#nullable enable
+#nullable enable
 using CoreMotion;
 using Foundation;
 using Uno.Extensions;
@@ -13,6 +13,16 @@ public partial class SimpleOrientationSensor
 		private const double _updateInterval = 0.5;
 		private const double _threshold = 0.5;
 
+		private static partial SimpleOrientationSensor? TryCreateInstance()
+		{
+			_motionManager ??= new CMMotionManager();
+
+			return _motionManager.DeviceMotionAvailable
+				? new SimpleOrientationSensor()
+				: null;
+		}
+
+
 		partial void Initialize()
 		{
 			if (_motionManager is { DeviceMotionAvailable: true })