---
title: "tabBarController(_:sidebarAvailabilityDidChange:)"
framework: uikit
role: symbol
role_heading: Instance Method
path: "uikit/uitabbarcontroller/sidebar-swift.class/delegate-swift.protocol/tabbarcontroller(_:sidebaravailabilitydidchange:)"
---

# tabBarController(_:sidebarAvailabilityDidChange:)

Notifies the delegate when UITabBarController.Sidebar.isAvailable changes.

## Declaration

```swift
optional func tabBarController(_ tabBarController: UITabBarController, sidebarAvailabilityDidChange sidebar: UITabBarController.Sidebar)
```