# Clear()

> Resets the hierarchy to an empty state, removing all nodes and the screen reader focus.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine.Accessibility](/engine/6000.7/script-reference/unityengine/accessibility.md)
* **Assembly:** UnityEngine.AccessibilityModule

```csharp
public void Clear()
```

### Remarks

**Warning**: When this hierarchy is the [\_activeHierarchy](/engine/6000.7/script-reference/unityengine/accessibility/assistivesupport/activehierarchy.md), this method has a non-trivial cost on the following platforms:

* **iOS**: Clearing the hierarchy has a high cost that scales with its size. Avoid calling this method frequently in performance-sensitive code.

* **macOS**: Clearing the hierarchy has a moderate cost that scales with its size. Calling this method frequently can affect performance.

Clearing an inactive hierarchy has no native cost.