--- title: "Hide or reveal an area in a PDF using Swift for iOS" canonical_url: "https://www.nutrient.io/guides/ios/samples/hide-reveal-area-in-pdf/" md_url: "https://www.nutrient.io/guides/ios/samples/hide-reveal-area-in-pdf.md" last_updated: "2026-05-25T12:14:42.940Z" description: "Allow users to select areas to hide and reveal on a page using a custom square annotation." --- # Hide or reveal an area in a PDF using Swift for iOS Allow users to select areas to hide and reveal on a page using a custom square annotation. [Get Started](https://www.nutrient.io/sdk/ios/getting-started.md) [All Samples](https://www.nutrient.io/guides/ios/samples.md) [Download](https://www.nutrient.io/guides/ios/downloads.md) [Launch Demo](https://www.nutrient.io/demo/) --- ```swift // // Copyright © 2020-2026 PSPDFKit GmbH. All rights reserved. // // The Nutrient sample applications are licensed with a modified BSD license. // Please see License for details. This notice may not be removed from this file. // import PSPDFKit import PSPDFKitUI class HideRevealAreaExample: Example { nonisolated static let hideAreaKey = "hideArea" nonisolated static let revealAreaKey = "revealArea" override init() { super.init() title = "Hide/Reveal Area" contentDescription = "Allow users to select areas to hide/reveal on a page" category =.annotations priority = 9 } override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController { let document = AssetLoader.document(for:.foodAndDrinks) // We use a subclassed annotation manager to use a custom annotation view for reveal areas. document.overrideClass(AnnotationManager.self, with: CustomAnnotationManager.self) // We use a subclassed square annotation to display hide and reveal area as overlay document.overrideClass(SquareAnnotation.self, with: CustomSquareAnnotation.self) let controller = HideRevealAreaPDFViewController(document: document, configuration: PDFConfiguration { $0.pageTransition =.scrollPerSpread $0.pageMode =.single $0.createAnnotationMenuGroups = [] $0.isTextSelectionEnabled = false $0.allowToolbarTitleChange = false $0.isAutosaveEnabled = false $0.thumbnailBarMode =.none // We use a subclassed resizable view to deliver resizing/moving events to the tracking view. $0.overrideClass(ResizableView.self, with: CustomResizableView.self) }) return controller } } private class HideRevealAreaPDFViewController: PDFViewController { let revealAreaButton: UIBarButtonItem let hideAreaButton: UIBarButtonItem override init(document: Document?, configuration: PDFConfiguration?) { revealAreaButton = UIBarButtonItem() hideAreaButton = UIBarButtonItem() super.init(document: document, configuration: configuration) delegate = self documentViewController?.delegate = self // Add reveal area and hide area buttons to the navigation bar and make sure their title is always updated revealAreaButton.target = self revealAreaButton.action = #selector(toggleRevealArea(_:)) hideAreaButton.target = self hideAreaButton.action = #selector(toggleHideArea(_:)) navigationItem.setRightBarButtonItems([hideAreaButton, revealAreaButton], for:.document, animated: false) updateButtonTitles() NotificationCenter.default.addObserver(self, selector: #selector(updateButtonTitles), name:.PSPDFAnnotationsAdded, object: nil) NotificationCenter.default.addObserver(self, selector: #selector(updateButtonTitles), name:.PSPDFAnnotationsRemoved, object: nil) } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } @objc func toggleRevealArea(_ sender: UIBarButtonItem) { // Check if there is an existing revealed area. If yes, delete it, if not, add a new one. if let revealArea = customSquare(onPageIndex: pageIndex, customDataString: HideRevealAreaExample.revealAreaKey) { document?.remove(annotations: [revealArea]) } else { addRevealArea() } } @objc func toggleHideArea(_ sender: UIBarButtonItem) { // Check if there is an existing hidden area. If yes, delete it, if not, add a new one. if let hideArea = customSquare(onPageIndex: pageIndex, customDataString: HideRevealAreaExample.hideAreaKey) { document?.remove(annotations: [hideArea]) } else { addHideArea() } } func customSquare(onPageIndex pageIndex: PageIndex, customDataString: String) -> Annotation? { // Reveal and hide areas use customData to be detectable. // We check here if a square annotation on a given page contains the customData value that is passed in. if let squares = document?.annotationsForPage(at: pageIndex, type:.square) { let customAnnotation = squares.first { annotation -> Bool in if let customDataValue = annotation.customData?[customDataString] as? Bool, customDataValue == true { return true } return false } return customAnnotation } return nil } func addRevealArea() { // Create, and add a new reveal area to the current page, and select it. let pageIndex = self.pageIndex let revealArea = CustomSquareAnnotation() revealArea.isRevealArea = true revealArea.boundingBox = CGRect(x: 51, y: 462, width: 309, height: 168) revealArea.color = UIColor.clear // Use a color other than clear, to make tapping the transparent area select the annotation. revealArea.fillColor = UIColor.white.withAlphaComponent(0.0) revealArea.lineWidth = 0 revealArea.pageIndex = pageIndex document?.add(annotations: [revealArea]) pageViewForPage(at: pageIndex)?.selectedAnnotations = [revealArea] } func addHideArea() { // Create, and add a new hide area to the current page, and select it. let pageIndex = self.pageIndex let hideAreaAnnotation = CustomSquareAnnotation() hideAreaAnnotation.isHideArea = true hideAreaAnnotation.boundingBox = CGRect(x: 360, y: 80.5, width: 201, height: 552) hideAreaAnnotation.color = UIColor.clear hideAreaAnnotation.fillColor = UIColor.black hideAreaAnnotation.lineWidth = 0 hideAreaAnnotation.pageIndex = pageIndex document?.add(annotations: [hideAreaAnnotation]) pageViewForPage(at: pageIndex)?.selectedAnnotations = [hideAreaAnnotation] } @objc func updateButtonTitles() { self.revealAreaButton.title = "Reveal Area" self.hideAreaButton.title = "Hide Area" if customSquare(onPageIndex: pageIndex, customDataString: HideRevealAreaExample.revealAreaKey)!= nil { self.revealAreaButton.title = "Reset Reveal Area" } if customSquare(onPageIndex: pageIndex, customDataString: HideRevealAreaExample.hideAreaKey)!= nil { self.hideAreaButton.title = "Reset Hide Area" } } } extension HideRevealAreaPDFViewController: PDFViewControllerDelegate { func pdfViewController(_ sender: PDFViewController, menuForAnnotations annotations: [Annotation], onPageView pageView: PDFPageView, appearance: EditMenuAppearance, suggestedMenu: UIMenu) -> UIMenu { // Keep only the Delete action. suggestedMenu.keep(actions: [.PSPDFKit.delete]) } func pdfViewController(_ sender: PDFViewController, menuForCreatingAnnotationAt point: CGPoint, onPageView pageView: PDFPageView, appearance: EditMenuAppearance, suggestedMenu: UIMenu) -> UIMenu { // Disable the annotation creation menu entirely. UIMenu(children: []) } } extension HideRevealAreaPDFViewController: PDFDocumentViewControllerDelegate { func documentViewController(_ documentViewController: PDFDocumentViewController, didChangeSpreadIndex oldSpreadIndex: Int) { updateButtonTitles() } } private class CustomSquareAnnotation: SquareAnnotation { override class var supportsSecureCoding: Bool { return true } override var isOverlay: Bool { get { // Always display reveal and hide areas as overlay, // which means that they are always rendered using their annotation view. if isRevealArea || isHideArea { return true } return super.isOverlay } set { super.isOverlay = newValue } } } private extension Annotation { var isRevealArea: Bool { // Use customData to mark an annotation as a reveal area. get { return customData?[HideRevealAreaExample.revealAreaKey] as? Bool?? false } set { customData = [HideRevealAreaExample.revealAreaKey: newValue] } } var isHideArea: Bool { // Use customData to mark an annotation as a hide area. get { return customData?[HideRevealAreaExample.hideAreaKey] as? Bool?? false } set { customData = [HideRevealAreaExample.hideAreaKey: newValue] } } } private class CustomAnnotationManager: AnnotationManager { override func annotationViewClass(for annotation: Annotation) -> AnyClass? { // Use a custom annotation view subclass for reveal areas. if annotation.isRevealArea { return RevealAreaView.self } return super.annotationViewClass(for: annotation) } } // Annotation view that displays a transparent area for the actual annotation bounding box, // and a black area for the rest of the page. private class RevealAreaView: AnnotationView { let backgroundView: UIView let fillLayer: CAShapeLayer override init(frame: CGRect) { // Add a background view with a shape layer to get the transparent area behavior we want. backgroundView = UIView() fillLayer = CAShapeLayer() fillLayer.fillRule = CAShapeLayerFillRule.evenOdd fillLayer.fillColor = UIColor.black.cgColor backgroundView.layer.addSublayer(fillLayer) isEditing = false super.init(frame: frame) self.addSubview(backgroundView) self.sendSubviewToBack(backgroundView) } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } var isEditing: Bool { didSet { // Make the page content shine through when we are editing (resizing or moving). fillLayer.opacity = isEditing? 0.8 : 1 } } override var pageView: PDFPageView? { didSet { if let pageView { updateBackgroundFrame(withBounds: pageView.bounds) } } } override func didChangePageBounds(_ bounds: CGRect) { updateBackgroundFrame(withBounds: bounds) } override var frame: CGRect { didSet { if let pageView { updateBackgroundFrame(withBounds: pageView.bounds) // Whenever the annotation view's frame change, we want to update the path for the shape layer. // We use a bezier path consiting of the page view bounds and the current annotation view's frame // while using the evenOdd fill rule, to get the expected behavior with the page content being covered in black // while the actual annotation bounding box is still transparent, with the page content being visible. let pagePath = UIBezierPath(rect: pageView.bounds) let annotationPath = UIBezierPath(rect: frame) pagePath.append(annotationPath) pagePath.usesEvenOddFillRule = true fillLayer.path = pagePath.cgPath } } } func updateBackgroundFrame(withBounds bounds: CGRect) { // Make sure the background view is always positioned correctly, covering the whole page view. var backgroundFrame = bounds backgroundFrame.origin = CGPoint(x: -self.frame.origin.x, y: -self.frame.origin.y) self.backgroundView.frame = backgroundFrame } } private class CustomResizableView: ResizableView, ResizableViewDelegate { override init(frame: CGRect) { super.init(frame: frame) self.delegate = self } required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") } // Let the annotation view know when the reveal area is resized or moved. func resizableViewDidBeginEditing(_ resizableView: ResizableView) { guard let revealAreaView = self.trackedViews?.first(where: { $0 is RevealAreaView }) as? RevealAreaView else { return } revealAreaView.isEditing = true } func resizableViewDidEndEditing(_ resizableView: ResizableView, didChangeFrame: Bool) { guard let revealAreaView = self.trackedViews?.first(where: { $0 is RevealAreaView }) as? RevealAreaView else { return } revealAreaView.isEditing = false } } ``` This code sample is an example that illustrates how to use our SDK. Please adapt it to your specific use case. --- ## Related pages - [Implement a Document Picker sidebar in Swift for iOS](/guides/ios/samples/document-picker-sidebar.md) - [Add file annotation to PDF in Swift for iOS](/guides/ios/samples/add-file-annotation-with-embedded-file.md) - [Add a custom cloudy rectangle annotation to a PDF in Swift for iOS](/guides/ios/samples/add-custom-cloudy-rectangle.md) - [Create an always-dark annotation toolbar in Swift for iOS](/guides/ios/samples/always-dark-annotation-toolbar.md) - [Add an image signature to PDF in Swift for iOS](/guides/ios/samples/add-image-signature-to-pdf-programmatically.md) - [Add an Apple Maps widget to a PDF page in Swift for iOS](/guides/ios/samples/add-map-widget-to-pdf.md) - [Add image gallery to PDF in Swift for iOS](/guides/ios/samples/add-image-gallery-to-pdf.md) - [Add video annotation to PDF in Swift for iOS](/guides/ios/samples/add-video-annotation-to-pdf.md) - [Customize blend modes in stamp annotations in Swift for iOS](/guides/ios/samples/annotation-inspector-stamp-blend-mode.md) - 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[Using Instant JSON to collaborate on PDFs in Swift for iOS](/guides/ios/samples/instant-json.md) - [Show PDF download progress in Swift for iOS](/guides/ios/samples/pdf-download-progress.md) - [Compare PDF documents using Swift for iOS](/guides/ios/samples/pdf-document-comparison.md) - [PDF page scale and resize using Swift for iOS](/guides/ios/samples/pdf-page-scaling.md) - [PDF collaboration using Swift for iOS](/guides/ios/samples/pdf-collaboration.md) - [Highlight text in PDF using Swift for iOS](/guides/ios/samples/highlight-text-in-pdf.md) - [Cycle through PDF documents using Swift for iOS](/guides/ios/samples/page-view-controller.md) - [PDF text redaction using regex in Swift for iOS](/guides/ios/samples/redact-pdf-text-using-regex.md) - [PDF magazine reader using Swift for iOS](/guides/ios/samples/pdf-magazine-reader.md) - [Search and redact text in a PDF using Swift for iOS](/guides/ios/samples/search-and-redact-pdf-text.md) - [Programmatically add a signature to all PDF pages using Swift for iOS](/guides/ios/samples/sign-all-pdf-pages.md) - [Store PDF annotations for multiple users in Swift for iOS](/guides/ios/samples/store-multiple-user-annotations.md) - [Show author name on annotation selection in Swift for iOS](/guides/ios/samples/show-author-name-on-annotation-selection.md) - [Customize PDF view settings in Swift for iOS](/guides/ios/samples/pdf-view-settings.md) - [Auto-save PDF annotation changes in Swift for iOS](/guides/ios/samples/save-as-pdf.md) - [Show note controller for highlights in Swift for iOS](/guides/ios/samples/show-note-controller-for-highlights.md) - [Swiftui Sharing](/guides/ios/samples/swiftui-sharing.md) - [Embed a SwiftUI view inside a page view on iOS](/guides/ios/samples/swiftui-on-page-view.md) - [Programmatically go to PDF outline in Swift for iOS](/guides/ios/samples/programmatically-go-to-outline.md) - [Show or hide PDF annotations using Swift for iOS](/guides/ios/samples/toggle-annotation-visibility.md) - [Enable fixed PDF toolbar position in Swift for iOS](/guides/ios/samples/top-toolbar-position.md) - [Encrypt disk cache when rendering PDF in Swift for iOS](/guides/ios/samples/encrypted-cache.md) - [Show multiple files as a single PDF using Swift for iOS](/guides/ios/samples/show-multiple-files-in-pdf.md) - [Use PDFViewController with SwiftUI for iOS](/guides/ios/samples/swiftui.md) - [Create a custom PDF navigation bar with SwiftUI for iOS](/guides/ios/samples/swiftui-custom-navigation-bar.md) - [SwiftUI split screen: Display two PDF views side by side on iOS](/guides/ios/samples/swiftui-split-screen.md) - [Programtically search a PDF using Swift for iOS](/guides/ios/samples/search-without-controller.md) - [Update configuration when rotating PDF in Swift for iOS](/guides/ios/samples/update-configuration-when-rotating.md) - [Render drawings on PDF pages using Swift for iOS](/guides/ios/samples/pdf-page-drawing.md) - [Convert MS Office (DOCX, XLSX, PPTX) to PDF in Swift for iOS](/guides/ios/samples/office-to-pdf-conversion.md) - [Show multiple PDFs with tabbed UI using Swift for iOS](/guides/ios/samples/tabbed-bar.md) - [Add SwiftUI sidebar next to PDF view on iOS](/guides/ios/samples/swiftui-sidebar.md) - [PDF streaming with SwiftUI for iOS](/guides/ios/samples/streaming-pdf-swiftui.md) - [Import and export annotations in XFDF using Swift for iOS](/guides/ios/samples/xfdf-annotation-provider.md) - [Customize PDF annotation toolbar with SwiftUI for iOS](/guides/ios/samples/swiftui-annotationt-toolbar.md) - [Custom annotation inspector with SwiftUI for iOS](/guides/ios/samples/swiftui-custom-annotation-inspector.md) - [Sticky header for PDF thumbnail view in Swift for iOS](/guides/ios/samples/sticky-header.md) - [PDF streaming using Swift for iOS](/guides/ios/samples/streaming-pdf.md) - [Create a custom PDF page setting view in SwiftUI for iOS](/guides/ios/samples/swiftui-settings.md) - [Add a snake game inside a PDF in Swift for iOS](/guides/ios/samples/snake.md) - [Integrate UIStoryboard with PDFViewController in Swift for iOS](/guides/ios/samples/storyboard.md) - [PDF form examples using Swift for iOS](/guides/ios/samples/pdf-forms.md) - [Display PDF annotations on layers in Swift for iOS](/guides/ios/samples/pdf-annotation-layers.md) - [Aviation example: Displaying flight plan PDF in Swift for iOS](/guides/ios/samples/aviation.md) - [Getting started with iOS playground](/guides/ios/samples/playground.md)