---
title: triggerValue
framework: homekit
role: symbol
role_heading: Instance Property
path: homekit/hmcharacteristicevent/triggervalue
---

# triggerValue

The value of the characteristic that triggers the event.

## Declaration

```swift
@NSCopying var triggerValue: TriggerValueType? { get }
```

## Discussion

Discussion A value of nil corresponds to any change in the value of the characteristic.

## See Also

### Inspecting the event

- [characteristic](homekit/hmcharacteristicevent/characteristic.md)