---
title: "runAction(_:completionHandler:)"
framework: scenekit
role: symbol
role_heading: Instance Method
path: "scenekit/scnactionable/runaction(_:completionhandler:)"
---

# runAction(_:completionHandler:)

Adds an action to the list of actions executed by the node. SceneKit calls the specified block when the action completes.

## Declaration

```swift
func runAction(_ action: SCNAction, completionHandler block: (@Sendable () -> Void)? = nil)
```

```swift
func runAction(_ action: SCNAction) async
```

## Parameters

- `action`: The action to be performed.
- `block`: A completion block that SceneKit calls when the action completes.

## Discussion

Discussion The new action is processed the next time SceneKit prepares to render a frame. SceneKit calls your block after the action’s duration is complete. For example, in a game you could use this method to show a Game Over message after performing a fade-out action on a node that displays a player character.

## See Also

### Running Actions

- [runAction(_:)](scenekit/scnactionable/runaction(_:).md)
- [runAction(_:forKey:)](scenekit/scnactionable/runaction(_:forkey:).md)
- [runAction(_:forKey:completionHandler:)](scenekit/scnactionable/runaction(_:forkey:completionhandler:).md)