---
title: "splitViewController(_:willShow:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uisplitviewcontrollerdelegate/splitviewcontroller(_:willshow:)"
---

# splitViewController(_:willShow:)

Tells the delegate that the specified column is about to be shown.

## Declaration

```swift
optional func splitViewController(_ svc: UISplitViewController, willShow column: UISplitViewController.Column)
```

## Parameters

- `svc`: The split view controller whose column is being shown.
- `column`: The column to be shown. See doc://com.apple.uikit/documentation/UIKit/UISplitViewController/Column for possible values.

## Discussion

Discussion This delegate method only applies to column-style split view interfaces. For more information, see Split view styles. The split view controller calls this method when the system is preparing to show one of its columns; for example, when a person rotates the device. The system doesn’t call this method when you display the column programmatically with show(_:). Use this method to perform any customization associated with showing the column. You can use the split view controller’s transitionCoordinator to coordinate any of your animations alongside the transition animation.

## See Also

### Expanding the interface

- [splitViewController(_:displayModeForExpandingToProposedDisplayMode:)](uikit/uisplitviewcontrollerdelegate/splitviewcontroller(_:displaymodeforexpandingtoproposeddisplaymode:).md)
- [splitViewController(_:didShow:)](uikit/uisplitviewcontrollerdelegate/splitviewcontroller(_:didshow:).md)
- [splitViewControllerDidExpand(_:)](uikit/uisplitviewcontrollerdelegate/splitviewcontrollerdidexpand(_:).md)