---
title: "actionStarted(event:)"
framework: realitykit
role: symbol
role_heading: Instance Method
path: "realitykit/actionhandlerprotocol/actionstarted(event:)"
---

# actionStarted(event:)

The function used to respond to action started events.

## Declaration

```swift
mutating func actionStarted(event: Self.EventType)
```

## Discussion

Discussion A start event is raised when the animation time first falls within an event’s defined time interval.