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# unregister(completionHandler:)

Unregisters the service so the system no longer launches it and calls a completion handler you provide with the resulting error value.

```
func unregister(completionHandler handler: @escaping @Sendable ((any Error)?) -> Void)
```

## Parameters

`handler`

A completion handler to call with the result of the unregistration operation. Upon an unsuccessful return, the handler contains a new <doc://com.apple.documentation/documentation/Foundation/NSError> object describing the error. Upon successful return, this argument is `NULL`.

## Discussion

> Important:
> You can call this method from synchronous code using a completion handler, as shown on this page, or you can call it as an asynchronous method that has the following declaration:
> 
> ```swift
> func unregister() async throws
> ```
> 
> For information about concurrency and asynchronous code in Swift, see <doc://com.apple.documentation/documentation/Swift/calling-objective-c-apis-asynchronously>.

---

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