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

# triggerValue

The value of the characteristic that triggers the event.

## Declaration

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

## Discussion

Discussion Use this property to adjust the value that triggers the event. Set this property to nil to trigger the event whenever the value of the characteristic changes.

## See Also

### Configuring the event

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