---
title: UISplitViewController.DisplayMode.oneOverSecondary
framework: uikit
role: symbol
role_heading: Case
path: uikit/uisplitviewcontroller/displaymode-swift.enum/oneoversecondary
---

# UISplitViewController.DisplayMode.oneOverSecondary

One sidebar is layered on top of the secondary view controller, leaving the secondary view controller partially visible.

## Declaration

```swift
case oneOverSecondary
```

## Discussion

Discussion This display mode shows one sidebar layered on top of the secondary view controller, partially obscuring it. The sidebar shown is the primary column for UISplitViewController.Style.doubleColumn interfaces and the supplementary column for UISplitViewController.Style.tripleColumn interfaces. The secondary view controller is dimmed out, preventing interaction with its view. Touching the dimmed view dismisses the overlay and returns the interface to the UISplitViewController.DisplayMode.secondaryOnly display mode. This display mode is available for the UISplitViewController.SplitBehavior.overlay split behavior.

## See Also

### Constants

- [UISplitViewController.DisplayMode.automatic](uikit/uisplitviewcontroller/displaymode-swift.enum/automatic.md)
- [UISplitViewController.DisplayMode.secondaryOnly](uikit/uisplitviewcontroller/displaymode-swift.enum/secondaryonly.md)
- [UISplitViewController.DisplayMode.oneBesideSecondary](uikit/uisplitviewcontroller/displaymode-swift.enum/onebesidesecondary.md)
- [UISplitViewController.DisplayMode.twoBesideSecondary](uikit/uisplitviewcontroller/displaymode-swift.enum/twobesidesecondary.md)
- [UISplitViewController.DisplayMode.twoOverSecondary](uikit/uisplitviewcontroller/displaymode-swift.enum/twooversecondary.md)
- [UISplitViewController.DisplayMode.twoDisplaceSecondary](uikit/uisplitviewcontroller/displaymode-swift.enum/twodisplacesecondary.md)