---
title: isRulerActive
framework: paperkit
role: symbol
role_heading: Instance Property
path: paperkit/papermarkupviewcontroller/isruleractive
---

# isRulerActive

A Boolean value that indicates whether a ruler view is visible on the canvas.

## Declaration

```swift
@MainActor @preconcurrency var isRulerActive: Bool { get set }
```

## See Also

### Editing markup

- [isEditable](paperkit/papermarkupviewcontroller/iseditable.md)
- [drawingTool](paperkit/papermarkupviewcontroller/drawingtool.md)