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# getActiveWindow(completionHandler:)

Calls the completion handler with the active browser window.

```
class func getActiveWindow(completionHandler: @escaping @Sendable (SFSafariWindow?) -> Void)
```

## Parameters

`completionHandler`

A block to call when the active browser window is returned.

## 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
> class func activeWindow() async -> SFSafariWindow?
> ```
> 
> For information about concurrency and asynchronous code in Swift, see <doc://com.apple.documentation/documentation/Swift/calling-objective-c-apis-asynchronously>.

If there is no active Safari window, the value of `activeWindow` is `nil`, and the completion handler is not called.

---

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