--- title: "Prepare PDF to embed PAdES digital signature in Swift for iOS" canonical_url: "https://www.nutrient.io/guides/ios/samples/contained-pades-digital-signature/" md_url: "https://www.nutrient.io/guides/ios/samples/contained-pades-digital-signature.md" last_updated: "2026-05-25T12:14:42.940Z" description: "Learn how to prepare documents for PAdES digital signatures. Access our guide for iOS resources and a Swift code example for contained signatures." --- # Prepare PDF to embed PAdES digital signature in Swift for iOS Prepare a document to embed a PAdES advanced digital signature afterwards. Get additional resources by visiting our guide on [contained digital signatures in iOS](/guides/ios/signatures/digital-signatures/contained-signatures.md). [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 /// The example here is similar to the `PrepareDocumentForContainedSignatureExample` example, only here we are preparing a /// different signature type that will be written into the document during the embed phase (`EmebedContainedPadesSignatureExample`). /// We are specifying the PDF advanced digital signature type "PAdES". This translates to the signature `SubFilter` value of /// "ETSI.CAdES.detached" in the PDF. /// /// Currently, we cannot write this signature type in the PDF, so this type can only work with "Contained" signatures, where the signature field is /// prepared first and a valid PAdES signature is inserted into the `Contents` entry of the PDF signature dictionary. /// /// Please refer to the ETSI standard for more information on PAdES signatures in PDF: /// https://www.etsi.org/deliver/etsi_ts/119100_119199/11914403/01.01.01_60/ts_11914403v010101p.pdf class PrepareDocumentForContainedPadesSignatureExample: Example { override init() { super.init() title = "Prepare a document to embed a PAdES advanced digital signature afterwards" category =.forms priority = 22 } override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController { // Load a sample document with an already created signature form field. let document = AssetLoader.writableDocument(for: "Form.pdf", overrideIfExists: true) // We know this document must have a file URL because we are loading it from a file. let newURL = document.fileURL! // Now we get the signature form widget. let signatureFormElement = document.annotations(at: 0, type: SignatureFormElement.self).first! // During document preparation, we are able to configure a custom digital signature appearance. // We use an instance of a `PSPDFSignatureAppearance` to do that. let signatureAppearance = PDFSignatureAppearance { $0.appearanceMode = PDFSignatureAppearance.Mode.signatureAndDescription $0.showSigningDate = false } // Configure a data sink as destination. let dataSink = try! FileDataSink(fileURL: newURL, options: []) // Now configure the signer that will prepare the signature field. Configuring the "signersName" property // will customize the signer's name that will appear on the visual signature. let signer = PDFSigner() signer.signersName = "PSPDFKit GmbH" // We also need to set the signature type to PAdES advanced for this example as the signature we // use in the signing step is PAdES compatible. signer.signatureType =.pades var preparedDocument: Document? // Typically, when preparing a document, we are not interested in what is inside the contents of the signature form field. // Passing an instance of a `PSPDFBlankSignatureContents` will fill the contents with zeroes. let signatureContents = BlankSignatureContents() signer.prepare(signatureFormElement, toBeSignedWith: signatureAppearance, contents: signatureContents, writingTo: dataSink) { (_ success: Bool, _ document: DataSink?, _ err: Error?) in let fileDataProvider = FileDataProvider(fileURL: newURL) do { try fileDataProvider.replaceContents(with: dataSink) } catch { print(error) } preparedDocument = Document(dataProviders: [fileDataProvider]) } return PDFViewController(document: preparedDocument!) } } /// This example takes the previously prepared "Form.pdf" in the `PrepareDocumentForContainedPadesSignatureExample` above, /// which contains space for a PAdES signature, and embeds a PAdES signature we have generated with external tools. /// /// Note: the PAdES signature creation mechanism is in progress at Nutrient, so it is only possible to sign a PDF with PAdES /// signature using a pre-prepared PAdES signature binary outlined in the steps above. class EmebedContainedPadesSignatureExample: Example { override init() { super.init() title = "Embed a PAdES advanced digital signature in an already prepared PDF document" category =.forms priority = 23 } override func invoke(with delegate: ExampleRunnerDelegate) -> UIViewController { // Load a sample document with a signature form field that was already prepared for signing with a PAdES signature. // See `PrepareDocumentForContainedPadesSignatureExample` to learn how to do that. let document = AssetLoader.writableDocument(for: "Form for PAdES Signing.pdf", overrideIfExists: true) let newURL = document.fileURL! // Now we get the signature form widget. let signatureFormElement = document.annotations(at: 0, type: SignatureFormElement.self).first! // The prepared signature is a.bin file that contains a PAdES signature using our JohnAppleseed self-signed // certificate. // See comments above this example class for how we generated this PAdES signature. let preparedSignatureSampleURL = AssetLoader.assetURL(for: "John Appleseed PAdES Signature.bin") // We use the sample `PSPDFSignatureContents` implementation `BinaryFileSignatureContents` from the // `ContainedDigitalSignaturesExample.swift` to load our pre-generated PAdES signature binary. let signatureContents = BinaryFileSignatureContents(signatureContentsPath: preparedSignatureSampleURL) let dataSink = try! FileDataSink(fileURL: newURL, options: []) // Finally, create the signer and embed the PAdES signature we have already generated in this document. let signer = PDFSigner() var preparedDocument: Document? signer.embedSignature(in: signatureFormElement, with: signatureContents, writingTo: dataSink) { (_ success: Bool, _ document: DataSink?, _ err: Error?) in let fileDataProvider = FileDataProvider(fileURL: newURL) do { try fileDataProvider.replaceContents(with: dataSink) } catch { print(error) } // Optionally, here you could make sure that the signed document is valid. // Read the `PSPDFSignatureValidator` documentation to learn how to do that. preparedDocument = Document(dataProviders: [fileDataProvider]) } return PDFViewController(document: preparedDocument!) } } ``` 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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