Create PDF with Multiple Pages

Create PDF with multiple pages

Output

Fixed using CTFramesetterCreateFrame and CFAttributedStringGetLength

---

class PDFCreator {

lazy var pageWidth : CGFloat  = {
    return 8.5 * 72.0
}()

lazy var pageHeight : CGFloat = {
    return 11 * 72.0
}()

lazy var pageRect : CGRect = {
    CGRect(x: 0, y: 0, width: pageWidth, height: pageHeight)
}()

lazy var marginPoint : CGPoint = {
    return CGPoint(x: 10, y: 10)
}()

lazy var marginSize : CGSize = {
    return CGSize(width: self.marginPoint.x * 2 , height: self.marginPoint.y * 2)
}()

func prepareData() -> Data {
    //1
    let pdfMetaData = [
      kCGPDFContextCreator: "PDF Creator",
      kCGPDFContextAuthor: "Pratik Sodha",
      kCGPDFContextTitle: "My PDF"
    ]

    //2
    let format = UIGraphicsPDFRendererFormat()
    format.documentInfo = pdfMetaData as [String: Any]

    //3
    let renderer = UIGraphicsPDFRenderer(bounds: pageRect, format: format)

    //5
    let data = renderer.pdfData { (context) in

        //6
        self.addText("Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.", context: context)
    }

    return data
}

@discardableResult
func addText(_ text : String, context : UIGraphicsPDFRendererContext) -> CGFloat {

    // 1
    let textFont = UIFont.systemFont(ofSize: 60.0, weight: .regular)

    // 2
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.alignment = .natural
    paragraphStyle.lineBreakMode = .byWordWrapping

    // 3
    let textAttributes = [
        NSAttributedString.Key.paragraphStyle: paragraphStyle,
        NSAttributedString.Key.font: textFont
    ]

    //4
    let currentText = CFAttributedStringCreate(nil,
                                               text as CFString,
                                               textAttributes as CFDictionary)
    //5
    let framesetter = CTFramesetterCreateWithAttributedString(currentText!)

    //6
    var currentRange = CFRangeMake(0, 0)
    var currentPage = 0
    var done = false
    repeat {

        //7
        /* Mark the beginning of a new page.*/
        context.beginPage()

        //8
        /*Draw a page number at the bottom of each page.*/
        currentPage += 1
        drawPageNumber(currentPage)

        //9
        /*Render the current page and update the current range to
          point to the beginning of the next page. */
        currentRange = renderPage(currentPage,
                                  withTextRange: currentRange,
                                  andFramesetter: framesetter)

        //10
        /* If we're at the end of the text, exit the loop. */
        if currentRange.location == CFAttributedStringGetLength(currentText) {
            done = true
        }

    } while !done

    return CGFloat(currentRange.location + currentRange.length)
}

func renderPage(_ pageNum: Int, withTextRange currentRange: CFRange, andFramesetter framesetter: CTFramesetter?) -> CFRange {
    var currentRange = currentRange
    // Get the graphics context.
    let currentContext = UIGraphicsGetCurrentContext()

    // Put the text matrix into a known state. This ensures
    // that no old scaling factors are left in place.
    currentContext?.textMatrix = .identity

    // Create a path object to enclose the text. Use 72 point
    // margins all around the text.
    let frameRect = CGRect(x: self.marginPoint.x, y: self.marginPoint.y, width: self.pageWidth - self.marginSize.width, height: self.pageHeight - self.marginSize.height)
    let framePath = CGMutablePath()
    framePath.addRect(frameRect, transform: .identity)

    // Get the frame that will do the rendering.
    // The currentRange variable specifies only the starting point. The framesetter
    // lays out as much text as will fit into the frame.
    let frameRef = CTFramesetterCreateFrame(framesetter!, currentRange, framePath, nil)

    // Core Text draws from the bottom-left corner up, so flip
    // the current transform prior to drawing.
    currentContext?.translateBy(x: 0, y: self.pageHeight)
    currentContext?.scaleBy(x: 1.0, y: -1.0)

    // Draw the frame.
    CTFrameDraw(frameRef, currentContext!)

    // Update the current range based on what was drawn.
    currentRange = CTFrameGetVisibleStringRange(frameRef)
    currentRange.location += currentRange.length
    currentRange.length = CFIndex(0)

    return currentRange
}

func drawPageNumber(_ pageNum: Int) {

    let theFont = UIFont.systemFont(ofSize: 20)

    let pageString = NSMutableAttributedString(string: "Page \(pageNum)")
    pageString.addAttribute(NSAttributedString.Key.font, value: theFont, range: NSRange(location: 0, length: pageString.length))

    let pageStringSize =  pageString.size()

    let stringRect = CGRect(x: (pageRect.width - pageStringSize.width) / 2.0,
                            y: pageRect.height - (pageStringSize.height) / 2.0 - 15,
                            width: pageStringSize.width,
                            height: pageStringSize.height)

    pageString.draw(in: stringRect)

}
}

Using PDFCreator class prepare pdf data and display using PDFView.

import UIKit
import PDFKit

class PDFPreviewViewController: UIViewController {

    //1
    @IBOutlet weak private var pdfView : PDFView!

    override func viewDidLoad() {

        super.viewDidLoad()

        //2
        let pdfData = PDFCreator().prepareData()

        //3
        pdfView.document = PDFDocument(data: pdfData)
        pdfView.autoScales = true
    }
}

How iText 7 create single pdf file with multiple pages while iteration in Java?

I feel you need to initialize your PdfDocument outside the loop so single doc is created.

Adding page breaks will not help, You can create new pages with

PdfDocument pdfDoc = new PdfDocument(writer);
// Adding an empty page 
pdfDoc.addNewPage();

Ref:
https://www.tutorialspoint.com/itext/itext_creating_pdf_document.htm

Also it would be worth checking addPage and addNewPage
https://api.itextpdf.com/iText7/java/7.0.0/com/itextpdf/kernel/pdf/PdfDocument.html#addPage-com.itextpdf.kernel.pdf.PdfPage-

How to create multi page PDF using syncfusion pdf creator?

I'm able to get the multiple page pdf using the following code

Future<void> _createPDFAndDownload(String? dataToAdd, int? fileName) async {
final PdfDocument document = PdfDocument();
final PdfPage page = document.pages.add();

final PdfLayoutResult? layoutResult = PdfTextElement(
        text: dataToAdd!,
        font: PdfStandardFont(PdfFontFamily.helvetica, 12),
        brush: PdfSolidBrush(PdfColor(0, 0, 0)))
    .draw(
        page: page,
        bounds: Rect.fromLTWH(
            0, 0, page.getClientSize().width, page.getClientSize().height),
        format: PdfLayoutFormat(
          layoutType: PdfLayoutType.paginate,
        ));
}

Generate multiple pages pdf in PHP Loop via AJAX using mPDF library

I'm not sure if this is the problem. But you are rewriting $markup variable every loop in the foreach with this sentence:

$markup = '<div class="info">';

You must to define $markup as empty before the foreach and then concatenate strings inside the foreach

$markup = ''; //<-- Add this first

// Headers are better out of the loop
header('Content-type: application/pdf');
header('Content-Disposition: inline; filename="' . $filename . '"');
header('Content-Transfer-Encoding: binary');
header('Accept-Ranges: bytes');
foreach ($group_user_ids as $group_user_id) {

    $user_data = get_userdata($group_user_id);

    // create pdf
    $markup .= '<div class="info">'; //<-- Concat here, you are rewriting
    $markup .= '<p><strong>' . __('User', 'group-shop') . ':</strong> ' . $user_data->display_name . '</p>';
    $markup .= '<p><strong>Email:</strong> ' . $user_data->user_email . '</p>';
    $markup .= '<p><strong>Admin:</strong> ' . $data[ 'group_admin' ] . '</p>';
    $markup .= '<p><strong>Group:</strong> ' . $data[ 'group_name' ] . '</p>';
    $markup .= '</div>';

    $markup .= '<table class="table">';
        // table markup
    $markup .= '</table>';

    // end of order table

    $markup .= '<pagebreak />';  //page break

} // $group_user_ids end
$mpdf->WriteHTML($markup, HTMLParserMode::HTML_BODY, TRUE);

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