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# splitViewController(_:willShow:)

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

```
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 [`UISplitViewController.Column`](/documentation/UIKit/UISplitViewController/Column) for possible values.

## Discussion

This delegate method only applies to column-style split view interfaces. For more information, see [`Split view styles`](/documentation/UIKit/UISplitViewController#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(_:)`](/documentation/UIKit/UISplitViewController/show(_:)). Use this method to perform any customization associated with showing the column. You can use the split view controller’s [`transitionCoordinator`](/documentation/UIKit/UIViewController/transitionCoordinator) to coordinate any of your animations alongside the transition animation.

---

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