---
title: stateUpdateHandler
framework: network
role: symbol
role_heading: Instance Property
path: network/nwlistener/stateupdatehandler
---

# stateUpdateHandler

A handler that receives listener state updates.

## Declaration

```swift
@preconcurrency final var stateUpdateHandler: (@Sendable (NWListener.State) -> Void)? { get set }
```

## See Also

### Creating Listeners

- [init(using:on:)](network/nwlistener/init(using:on:).md)
- [start(queue:)](network/nwlistener/start(queue:).md)
- [NWListener.State](network/nwlistener/state-swift.enum.md)
- [port](network/nwlistener/port.md)
- [cancel()](network/nwlistener/cancel().md)