Mac app with swiftUI printing pdfs from a url.

Question

Created May ’23

Replies 2

Boosts 1

Views 1.4k

Participants 2

I have a mac app using swiftUI framework. I get a pdf url from an api and I need to allow the user to click a button that prints the pdf.

I have it working as of right now, The alignment of the pdf is just off. What I mean is it looks like a pasted a pdf on top of another pdf so my margins are bigger than normal and I have a weird outline of the url pdf on the printed pdf.

To my understanding I can out of the box use UIKit in a mac app to use the UIPrintInteractionController.

I am using the NSPrintOperation right now.

import SwiftUI
import PDFKit
import AppKit
struct ContentView: View {
    let pdfDocumentUrl = URL(string: "https:&#x2F;&#x2F;www.soundczech.cz&#x2F;temp&#x2F;lorem-ipsum.pdf")!

    
    var body: some View {
        VStack {
            Button("Print PDF") {
                let pdf = PDFDocument(url: pdfDocumentUrl)!
                printPDFDocumentt(pdf)
            }
        }
        .padding()
    }
    
    func printPDFDocumentt(_ document: PDFDocument) {
        
        let pdfView = PDFView(frame: .init(x: 0, y: 0, width: document.page(at: 
0)?.bounds(for: .mediaBox).width ?? 0, 
![]("https:&#x2F;&#x2F;developer.apple.com&#x2F;forums&#x2F;content&#x2F;attachment&#x2F;5554c20f-7247-4300-b0b1-1f7a7ab6ebbe" "title=CleanShot 2023-05-09 at 11.46.25@2x.png;width=1528;height=2040")

                                                        height: document.page(at: 0)?.bounds(for: .mediaBox).height ?? 0))
        pdfView.document = document
        pdfView.backgroundColor = .clear
        
        let printInfo = NSPrintInfo.shared
        printInfo.horizontalPagination = .fit
        printInfo.verticalPagination = .fit
        printInfo.orientation = .portrait
        printInfo.topMargin = 0
        printInfo.bottomMargin = 0
        printInfo.leftMargin = 0
        printInfo.rightMargin = 0
        
        let printOperation = NSPrintOperation(view: pdfView, printInfo: printInfo)
        printOperation.run()
    }
}

CleanShot 2023-05-09 at 11.46.25@2x.png

Answered by Trey6 in 753083022

Found the solution to my problem. In my code above, I had a pdfDocument object and then I created the PDFView and tried to send it to the printer using NSPrintOperation.

I think setting the PDFView document as the downloaded pdf was the issue. So What I came up with was using the PDFDocument.printOperation and changed my printDocumentFunction

    private func printPDFDocumentt(_ document: PDFDocument) {
        
        let printInfo = NSPrintInfo.shared
        printInfo.horizontalPagination = .fit
        printInfo.verticalPagination = .fit
        printInfo.orientation = .portrait
        printInfo.topMargin = 0
        printInfo.bottomMargin = 0
        printInfo.leftMargin = 0
        printInfo.rightMargin = 0
        printInfo.isHorizontallyCentered = true
        printInfo.isVerticallyCentered = true
        
        let scale: PDFPrintScalingMode = .pageScaleDownToFit
        
        let printOp = document.printOperation(for: printInfo, scalingMode: scale, autoRotate: true)

        DispatchQueue.main.async {
            printOp?.run()
        }
    }

Boost

Answer 1

Trey6 OP

May ’23

Update to this. Ive decided to try downloading the pdf file to my mac desktop and view the results. When I do this, the PDF looks completely normal.

I think there is something wrong with how I am creating my printPDFDocumentt function. Almost as if I have a pdfDocument and I am pasting the document to a new created PDFView and thats whats causing the weird pasting affect. Not sure exactly.

NSPrintOperation(view: pdfView, printInfo: printInfo)

this functino accepts a view of type NSView, Is there a way to convert a PDFDocument to an NSView?

0

Answer 2

Trey6 OP

May ’23

Accepted Answer

Found the solution to my problem. In my code above, I had a pdfDocument object and then I created the PDFView and tried to send it to the printer using NSPrintOperation.

I think setting the PDFView document as the downloaded pdf was the issue. So What I came up with was using the PDFDocument.printOperation and changed my printDocumentFunction

    private func printPDFDocumentt(_ document: PDFDocument) {
        
        let printInfo = NSPrintInfo.shared
        printInfo.horizontalPagination = .fit
        printInfo.verticalPagination = .fit
        printInfo.orientation = .portrait
        printInfo.topMargin = 0
        printInfo.bottomMargin = 0
        printInfo.leftMargin = 0
        printInfo.rightMargin = 0
        printInfo.isHorizontallyCentered = true
        printInfo.isVerticallyCentered = true
        
        let scale: PDFPrintScalingMode = .pageScaleDownToFit
        
        let printOp = document.printOperation(for: printInfo, scalingMode: scale, autoRotate: true)

        DispatchQueue.main.async {
            printOp?.run()
        }
    }

2