---
title: "Configuring scroll views"
canonical_url: "https://www.nutrient.io/guides/ios/knowledge-base/configuring-scroll-views/"
md_url: "https://www.nutrient.io/guides/ios/knowledge-base/configuring-scroll-views.md"
last_updated: "2026-05-14T16:53:43.872Z"
description: "Our PDF viewer relies on multiple scroll views to set up its complex view hierarchy. When these scroll views are configured."
---

Our [PDF viewer](https://www.nutrient.io/guides/ios/viewer.md) relies on multiple scroll views to set up its complex [view hierarchy](https://www.nutrient.io/guides/ios/customizing-the-interface/the-document-view-hierarchy.md). When these scroll views are configured, the [document view controller](https://www.nutrient.io/api/ios/documentation/pspdfkitui/pdfdocumentviewcontroller) calls two delegate methods for you to customize the scroll views or to set their `delegate` in.

You can start by setting the document view controller’s [`delegate`](https://www.nutrient.io/api/ios/documentation/pspdfkitui/pdfdocumentviewcontrollerdelegate):

```swift

pdfViewController.documentViewController?.delegate =...

```

Then, implement one or two of the following delegate methods.

`documentViewController(_:configureScrollView:)` is called when the document view controller is configuring the scroll view responsible for scrolling the spreads.

`documentViewController(_:configureZoom:forSpreadAt:)`, on the other hand, is called when the document view controller is configuring a scroll view responsible for zooming one or multiple spreads.

```swift

func documentViewController(_ documentViewController: PDFDocumentViewController, configureScrollView scrollView: UIScrollView) {
    // Here you can customize some of the scroll view's properties.
    scrollView.bounces = false
}

func documentViewController(_ documentViewController: PDFDocumentViewController, configureZoom zoomView: UIScrollView, forSpreadAt spreadIndex: Int) {
    // You can also set the delegate.
    zoomView.delegate =...
}

```

Once you set a `delegate` of either one of the scroll views, you can implement standard [`UIScrollViewDelegate`](https://developer.apple.com/documentation/uikit/uiscrollviewdelegate) methods to be notified about a variety of events:

```swift

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    print("New content offset:", scrollView.contentOffset)
}

```

For more information, refer to our guides on [the document view hierarchy](https://www.nutrient.io/guides/ios/customizing-the-interface/the-document-view-hierarchy.md) and [handling user interactions](https://www.nutrient.io/guides/ios/customizing-the-interface/handling-user-interactions.md).
---

## Related pages

- [Adjusting Size Of Popovers](/guides/ios/knowledge-base/adjusting-size-of-popovers.md)
- [Fix app store connect operation errors in Xcode](/guides/ios/knowledge-base/app-store-connect-operation-errors.md)
- [Archive Errors Cocoapods](/guides/ios/knowledge-base/archive-errors-cocoapods.md)
- [Customize your iOS navigation bar above crop UI](/guides/ios/knowledge-base/customize-the-navigation-bar-in-crop.md)
- [Adding Swipe Gesture Recognizer](/guides/ios/knowledge-base/adding-swipe-gesture-recognizer.md)
- [Debugging Issues](/guides/ios/knowledge-base/debugging-issues.md)
- [Adding Vector Image Annotation From Instant Json](/guides/ios/knowledge-base/adding-vector-image-annotation-from-instant-json.md)
- [Disabling Auto Opening Comments](/guides/ios/knowledge-base/disabling-auto-opening-comments.md)
- [Customizing Annotation Toolbar Frame](/guides/ios/knowledge-base/customizing-annotation-toolbar-frame.md)
- [Customize Share Sheet Apps](/guides/ios/knowledge-base/customize-share-sheet-apps.md)
- [Customize PDF rendering on iOS](/guides/ios/knowledge-base/customize-document-rendering.md)
- [Disabling Directional Lock](/guides/ios/knowledge-base/disabling-directional-lock.md)
- [Disabling Text Selection](/guides/ios/knowledge-base/disabling-text-selection.md)
- [Disabling Adding Pages With Images](/guides/ios/knowledge-base/disabling-adding-pages-with-images.md)
- [Gatekeeper Alerts Mac Catalyst](/guides/ios/knowledge-base/gatekeeper-alerts-mac-catalyst.md)
- [Customize action sheet appearance on iOS links](/guides/ios/knowledge-base/hide-or-customize-the-action-sheet-link-long-press.md)
- [Drawing An Upright Stamp Annotation On A Rotated Page](/guides/ios/knowledge-base/drawing-an-upright-stamp-annotation-on-a-rotated-page.md)
- [How Do I Change How To Open Links](/guides/ios/knowledge-base/how-do-i-change-how-to-open-links.md)
- [Generate PDFs from complex HTML](/guides/ios/knowledge-base/generating-pdf-from-complex-html.md)
- [How Do I Customize Search Results](/guides/ios/knowledge-base/how-do-i-customize-search-results.md)
- [Adding a custom view controller in iOS](/guides/ios/knowledge-base/how-do-i-add-custom-controller-to-containerviewcontroller.md)
- [How Do I Migrate From Cocoapods To Spm](/guides/ios/knowledge-base/how-do-i-migrate-from-cocoapods-to-spm.md)
- [How Do I Customize The Annotation Inspector](/guides/ios/knowledge-base/how-do-i-customize-the-annotation-inspector.md)
- [How Do I Download Pspdfkit As Fat Frameworks](/guides/ios/knowledge-base/how-do-i-download-pspdfkit-as-fat-frameworks.md)
- [Get notifications for unlocked password-protected PDFs](/guides/ios/knowledge-base/how-do-i-get-notified-when-a-password-protected-document-is-unlocked.md)
- [How Do I Present A Pspdftabbedviewcontroller In Cordova](/guides/ios/knowledge-base/how-do-i-present-a-pspdftabbedviewcontroller-in-cordova.md)
- [Other dependencies.](/guides/ios/knowledge-base/how-do-i-migrate-from-carthage-to-spm.md)
- [Capture ink signatures using SignatureViewController](/guides/ios/knowledge-base/how-do-i-get-an-image-from-signatureviewcontroller.md)
- [How Do I Remove The Sign Arrow From The Signature Form Field](/guides/ios/knowledge-base/how-do-i-remove-the-sign-arrow-from-the-signature-form-field.md)
- [How Do I Select Or Deselect An Annotation Programmatically](/guides/ios/knowledge-base/how-do-i-select-or-deselect-an-annotation-programmatically.md)
- [How to add annotations programmatically in iOS](/guides/ios/knowledge-base/how-do-i-programmatically-add-annotation-to-the-saved-annotations-list.md)
- [Fixing library not found issues in iOS apps](/guides/ios/knowledge-base/library-not-found-swiftpm.md)
- [Fix incorrect page color in night appearance mode](/guides/ios/knowledge-base/how-do-i-reset-custom-document-render-options-before-change-the-appearance-mode.md)
- [Block annotation editing and deletion in iOS](/guides/ios/knowledge-base/prevent-annotation-editing-allow-manipulation.md)
- [Creating invisible digital signatures on iOS](/guides/ios/knowledge-base/invisible-signature.md)
- [Search Special Characters](/guides/ios/knowledge-base/search-special-characters.md)
- [Processor Write To File Url](/guides/ios/knowledge-base/processor-write-to-file-url.md)
- [Setting The Initial Page Selection When Sharing](/guides/ios/knowledge-base/setting-the-initial-page-selection-when-sharing.md)
- [Separate Photo Library And Camera Actions](/guides/ios/knowledge-base/separate-photo-library-and-camera-actions.md)
- [Zoom to specific PDF annotations easily](/guides/ios/knowledge-base/zoom-to-specific-annotation.md)
- [Showing Annotation Tools In The Main Toolbar](/guides/ios/knowledge-base/showing-annotation-tools-in-the-main-toolbar.md)
- [How to store electronic signatures using Instant JSON](/guides/ios/knowledge-base/store-electronic-signatures-from-instant-json-annotations.md)
- [Suppressing File Coordination Alerts](/guides/ios/knowledge-base/suppressing-file-coordination-alerts.md)