---
title: "adjustViewport(byVerticalOffset:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/nstextviewportlayoutcontroller/adjustviewport(byverticaloffset:)"
---

# adjustViewport(byVerticalOffset:)

Adjusts the viewport rect by the specified offset if needed.

## Declaration

```swift
func adjustViewport(byVerticalOffset verticalOffset: CGFloat)
```

## Parameters

- `verticalOffset`: A CGFloat that represents the offset amount to apply to the viewport.

## See Also

### Accessing the viewport characteristics

- [viewportBounds](uikit/nstextviewportlayoutcontroller/viewportbounds.md)
- [viewportRange](uikit/nstextviewportlayoutcontroller/viewportrange.md)
- [layoutViewport()](uikit/nstextviewportlayoutcontroller/layoutviewport().md)
- [relocateViewport(to:)](uikit/nstextviewportlayoutcontroller/relocateviewport(to:).md)