---
title: EventParameterType
framework: realitykit
role: symbol
role_heading: Associated Type
path: realitykit/entityaction/eventparametertype
---

# EventParameterType

The associated event parameter type.

## Declaration

```swift
associatedtype EventParameterType = Never
```

## Discussion

Discussion Event parameters are used when more than one event interval is defined for a single action animation. Event parameters can vary for each event interval. The parameter data associated with each event will be returned to the event handler when it is called. The default parameter type is Never so that it does not need to be defined for single event action animations.