---
title: "popoverWillShow(in:)"
framework: safariservices
role: symbol
role_heading: Instance Method
path: "safariservices/sfsafariextensionhandling/popoverwillshow(in:)"
---

# popoverWillShow(in:)

Tells the handler that the app extension’s popover is about to be opened.

## Declaration

```swift
optional func popoverWillShow(in window: SFSafariWindow)
```

## Parameters

- `window`: The window to display the popover in.

## Mentioned in

Adjusting settings for a toolbar item

## Discussion

Discussion This method is called when a popover associated with the app extension is triggered.

## See Also

### Working with Popovers

- [popoverViewController()](safariservices/sfsafariextensionhandling/popoverviewcontroller().md)
- [popoverDidClose(in:)](safariservices/sfsafariextensionhandling/popoverdidclose(in:).md)