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# CHHapticEvent.ParameterID

An identifier for an event parameter.

```
struct ParameterID
```

## Discussion

Specify event parameters when creating a haptic or audio event. The combination of parameters determines the event’s character.

## Topics

### Haptic Event Parameter IDs

[`hapticIntensity`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/hapticIntensity)

The strength of a haptic event.

[`hapticSharpness`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/hapticSharpness)

The feel of a haptic event.

[`attackTime`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/attackTime)

The time at which a haptic pattern’s intensity begins increasing.

[`decayTime`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/decayTime)

The time at which a haptic pattern’s intensity begins decreasing.

[`releaseTime`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/releaseTime)

The time at which to begin fading the haptic pattern.

[`sustained`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/sustained)

A Boolean value that indicates whether to sustain a haptic event for its specified duration.

### Audio Event Parameter IDs

[`audioVolume`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/audioVolume)

The volume of an audio event.

[`audioPan`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/audioPan)

The stereo panning of an audio event.

[`audioPitch`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/audioPitch)

The pitch of an audio event.

[`audioBrightness`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/audioBrightness)

The high-frequency content of an audio event.

### Swift Initializers

[`init(rawValue:)`](/documentation/CoreHaptics/CHHapticEvent/ParameterID/init(rawValue:))

Creates the identifier of a haptic event parameter with the specified string value.


---

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