---
title: trackFillColor
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nsslider/trackfillcolor
---

# trackFillColor

The color of the filled portion of the slider track, in appearances that support it.

## Declaration

```swift
@NSCopying var trackFillColor: NSColor? { get set }
```

## See Also

### Managing the slider’s appearance

- [sliderType](appkit/nsslider/slidertype-swift.property.md)
- [NSSlider.SliderType](appkit/nsslider/slidertype-swift.enum.md)
- [altIncrementValue](appkit/nsslider/altincrementvalue.md)
- [knobThickness](appkit/nsslider/knobthickness.md)
- [isVertical](appkit/nsslider/isvertical.md)
- [tintProminence](appkit/nsslider/tintprominence.md)
- [NSTintProminence](appkit/nstintprominence.md)