Swift

PDF Signatures with Built-in SVG Graphics

See more PDF Signatures Examples

This example demonstrates the built-in SVG graphics that can be applied to the appearance when signing a PDF.

Note: This example requires Chilkat v9.5.0.85 or greater.

Swift

func chilkatTest() {
    var success: Bool = false

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    let pdf = CkoPdf()!

    //  Load a PDF to be signed.
    //  The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    success = pdf.loadFile(filePath: "qa_data/pdf/hello.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    //  Options for signing are specified in JSON.
    let json = CkoJsonObject()!

    //  In most cases, the signingCertificateV2 and signingTime attributes are required.
    json.updateInt(jsonPath: "signingCertificateV2", value: 1)
    json.updateInt(jsonPath: "signingTime", value: 1)

    //  Specify the location/position, scale, and content of the signature's appearance.
    json.updateInt(jsonPath: "page", value: 1)
    json.updateString(jsonPath: "appearance.y", value: "top")
    json.updateString(jsonPath: "appearance.x", value: "left")
    json.updateString(jsonPath: "appearance.fontScale", value: "10.0")
    json.updateString(jsonPath: "appearance.text[0]", value: "Digitally signed by: cert_cn")
    json.updateString(jsonPath: "appearance.text[1]", value: "current_dt")
    json.updateString(jsonPath: "appearance.text[2]", value: "The crazy brown fox jumps over the lazy dog.")

    //  In addition to the above, this example adds a built-in SVG graphic to the appearance.
    //  The built-in SVG graphic is specified by a name, such as "green-check-grey-circle".
    //  The full list of graphic names and images are shown below.
    json.updateString(jsonPath: "appearance.image", value: "green-check-grey-circle")

    //  The graphic can be placed "left", "center", or "right".
    //  If "center", then the graphic is displayed behind the text.
    json.updateString(jsonPath: "appearance.imagePlacement", value: "left")

    //  The graphic's opacity can range from 1 to 100.
    //  Centered graphics look best with less opacity (50 or less).
    //  In this example, we'll keep the opacity at 100.
    json.updateString(jsonPath: "appearance.imageOpacity", value: "100")

    //  Here's an example of the signature's appearance if we centered the SVG graphic with an opacity of 40%
    //  

    //  Load the signing certificate. (Use your own certificate.)
    let cert = CkoCert()!
    success = cert.loadPfxFile(path: "qa_data/pfx/myPdfSigningCert.pfx", password: "secret")
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    //  Tell the pdf object to use the certificate for signing.
    success = pdf.setSigningCert(cert: cert)
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    success = pdf.sign(jsonOptions: json, outFilePath: "qa_output/hello_signed.pdf")
    if success == false {
        print("\(pdf.lastErrorText!)")
        return
    }

    print("The PDF has been successfully cryptographically signed.")

    //  The appearance of the signature appears in Adobe Acrobat as shown here:

    //  

    //  The SVG icon graphics are embedded within the Chilkat library, 
    //  and were graciously provided by uxwing - Free SVG Icons 
    //  
    //  The uxwing licensing terms are reproduced here and can be verified at uxwing licensing

    //  Icons from uxwing.com are free (see https://uxwing.com/license/)
    //  	- All icons on UXWing free to download, and use personal, commercial projects.
    //  	- Attribution and Credit is NOT required, however, any credit will be much appreciated.
    //  	- There is no limit to the number of times you can use.
    //  	- You may modify the resources according to your requirements.

    //  The set of SVG names and the corresponding graphics are shown below.
    //  
    //  For example, if we specify "green-check-green-circle"
    json.updateString(jsonPath: "appearance.image", value: "green-check-green-circle")
    //  We get:
    //  

    //  "application-approved"
    //  

    //  "application-rejected"
    //  

    //  "document-accepted"
    //  

    //  "approved"
    //  

    //  "blue-check-mark"
    //  

    //  "green-check-mark"
    //  

    //  "green-check-grey-circle"
    //  

    //  "red-x-red-circle"
    //  

    //  "rejected"
    //  

    //  "result-failure"
    //  

    //  "result-pass"
    //  

    //  "signature"
    //  

    //  "document-check"
    //  

    //  "document-x"
    //  

    //  "red-x-grey-circle"
    //  

}