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# UITabBarDelegate

The [`UITabBarDelegate`](/documentation/UIKit/UITabBarDelegate) protocol defines optional methods for a delegate of a [`UITabBar`](/documentation/UIKit/UITabBar) object. The [`UITabBar`](/documentation/UIKit/UITabBar) class provides the ability for the user to reorder, remove, and add items to the tab bar; this process is referred to as customizing the tab bar. The tab bar delegate receives messages when customizing occurs.

```
@MainActor protocol UITabBarDelegate : NSObjectProtocol
```

## Overview

Send [`beginCustomizingItems(_:)`](/documentation/UIKit/UITabBar/beginCustomizingItems(_:)) to a [`UITabBar`](/documentation/UIKit/UITabBar) object to begin customizing. Implement the methods in Customizing tab bars to intervene while a user is customizing a tab bar. The customizing modal view is dismissed when the user taps the Done button on the modal view.

## Topics

### Customizing tab bars

[`tabBar(_:willBeginCustomizing:)`](/documentation/UIKit/UITabBarDelegate/tabBar(_:willBeginCustomizing:))

Sent to the delegate before the customizing modal view is displayed.

[`tabBar(_:didBeginCustomizing:)`](/documentation/UIKit/UITabBarDelegate/tabBar(_:didBeginCustomizing:))

Sent to the delegate after the customizing modal view is displayed.

[`tabBar(_:willEndCustomizing:changed:)`](/documentation/UIKit/UITabBarDelegate/tabBar(_:willEndCustomizing:changed:))

Sent to the delegate before the customizing modal view is dismissed.

[`tabBar(_:didEndCustomizing:changed:)`](/documentation/UIKit/UITabBarDelegate/tabBar(_:didEndCustomizing:changed:))

Sent to the delegate after the customizing modal view is dismissed.

[`tabBar(_:didSelect:)`](/documentation/UIKit/UITabBarDelegate/tabBar(_:didSelect:))

Sent to the delegate when the user selects a tab bar item.


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