---
title: "tabBarControllerWillBeginEditing(_:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uitabbarcontrollerdelegate/tabbarcontrollerwillbeginediting(_:)"
---

# tabBarControllerWillBeginEditing(_:)

Notifies the delegate when the tab bar controller is about to begin editing.

## Declaration

```swift
optional func tabBarControllerWillBeginEditing(_ tabBarController: UITabBarController)
```