LightSensor

[!TIP] This article covers Uno-specific information for LightSensor. For a full description of the feature and instructions on using it, see Use the light sensor.

The Windows.Devices.Sensors.LightSensor class allows measuring the illuminance in LUX.

Supported features

Feature	Windows	Android	iOS	Wasm	macOS	Skia
`GetDefault`	✔	✔	✖	✔	✖	✖
`ReadingChanged`	✔	✔	✖	✔	✖	✖
`ReportInterval`	✔	✔	✖	✖	✖	✖

Using LightSensor with Uno

The GetDefault method is available on all targets and will return null on those which do not support LightSensor or devices that do not have such a sensor.
Ensure to unsubscribe from the ReadingChanged events when you no longer need the readings, so that the sensor is no longer active to avoid unnecessary battery consumption.

Examples

Capturing sensor readings

csharp

var lightSensor = LightSensor.GetDefault();
lightSensor.ReadingChanged += LightSensor_ReadingChanged;

private async void LightSensor_ReadingChanged(LightSensor sender, LightSensorReadingChangedEventArgs args)
{
    // If you want to update the UI in some way, ensure the Dispatcher is used,
    // as the ReadingChanged event handler does not run on the UI thread.
    await Dispatcher.RunAsync(CoreDispatcherPriority.Normal, () =>
    {
        OutputTextBlock.Text = $"Sensor reading is " +
            $"IlluminanceInLux = {args.Reading.IlluminanceInLux}, " + 
            $"timestamp = {args.Reading.Timestamp}";
    });
}

Unsubscribing from the readings

csharp

lightSensor.ReadingChanged -= LightSensor_ReadingChanged;