---
title: "init(handler:)"
framework: appkit
role: symbol
role_heading: Initializer
path: "appkit/nsslideraccessorybehavior/init(handler:)"
---

# init(handler:)

The handler block is invoked on interaction.

## Declaration

```swift
init(handler: @escaping (NSSliderAccessory) -> Void)
```

## Discussion

Discussion This variant is not codable and will assert in -encodeWithCoder:.

## See Also

### Initializers

- [init(target:action:)](appkit/nsslideraccessorybehavior/init(target:action:).md)