---
title: systemFill
framework: uikit
role: symbol
role_heading: Type Property
path: uikit/uicolor/systemfill
---

# systemFill

An overlay fill color for thin and small shapes.

## Declaration

```swift
class var systemFill: UIColor { get }
```

## Discussion

Discussion Use system fill colors for items situated on top of an existing background color. System fill colors incorporate transparency to allow the background color to show through. Use this color to fill thin or small shapes, such as the track of a slider.

## See Also

### Fill colors

- [secondarySystemFill](uikit/uicolor/secondarysystemfill.md)
- [tertiarySystemFill](uikit/uicolor/tertiarysystemfill.md)
- [quaternarySystemFill](uikit/uicolor/quaternarysystemfill.md)