---
title: "scrollView(_:handle:completion:)"
framework: browserenginekit
role: symbol
role_heading: Instance Method
path: "browserenginekit/bescrollviewdelegate/scrollview(_:handle:completion:)"
---

# scrollView(_:handle:completion:)

Handles a scroll update before the scroll view reacts to it.

## Declaration

```swift
optional func scrollView(_ scrollView: BEScrollView, handle scrollUpdate: BEScrollViewScrollUpdate, completion: @escaping (Bool) -> Void)
```

```swift
optional func scrollView(_ scrollView: BEScrollView, handle scrollUpdate: BEScrollViewScrollUpdate) async -> Bool
```

## Parameters

- `scrollView`: The doc://com.apple.BrowserEngineKit/documentation/BrowserEngineKit/BEScrollView that receives the scroll update.
- `scrollUpdate`: An object that describes the scroll update. Retrieve all information from this object immediately on the main queue when the system calls your delegate method, as the values may change.
- `completion`: A block to call when you finish processing the scroll update. Pass true if you handled the scroll event and the scroll view doesn’t need to react to it; pass false otherwise.

## Discussion

Discussion Your BEScrollViewDelegate receives scroll updates before its delegating scroll view handles them. The system calls this method on the main queue — retrieve information from scrollUpdate on the main queue, then process the update asynchronously. Call the completion block asynchronously on the main queue when you finish processing. important: Call completion blocks on the main queue in the same order in which you receive scroll updates.