Agfdhyk

I'm making a macOS app at the moment, and I'm trying to support printing. I've added NSBox to represent the pages I want to print inside an NSScrollView, so the hierarchy looks like this

NSScrollView

|- NSDocumentView

   |- NSBox

   |- NSBox

In the ViewController, when the user clicks on print, I run the following code

let printOperation = NSPrintOperation(view: self.previewView, printInfo: printInfo)



if let window = self.view.window {

    printOperation.runModal(for: window, delegate: self, didRun: #selector(PrintPreviewViewController.printOperationDidRun(_:success:contextInfo:)), contextInfo: nil)

}

In the NSDocumentView subclass, I've implemented

override func knowsPageRange(_ range: NSRangePointer) -> Bool {



    var numberOfPages = 0



    for i in 0..<pages.count {

        numberOfPages += pages[i].count

    }



    range.pointee.location = 1

    range.pointee.length = numberOfPages



    return true

}



override func rectForPage(_ page: Int) -> NSRect {



    var pageNumber = 1



    for i in 0..<pages.count {

        for j in 0..<pages[i].count {



            if pageNumber == page {

                return pages[i][j].frame

            }

            pageNumber += 1

        }

    }



    return NSRect(x: 0, y: 0, width: 300, height: 300)



}

When I run, I see the print sheet that all looks correct.

But when I finally confirm print, I get these errors in the console, and a blank sheet.

CGContextGetCTM: invalid context 0x0

CGContextTranslateCTM: invalid context 0x0

I don't know what this means, as everything is displayed correctly inside the NSScrollView, and even the print preview.
I tried to narrow down the issue, I tried making a blank project with just one NSBox inside an NSScrollView, and I was having the same issue. I tried changing the size of NSRect bering returned in rectForPage(), but nothing works. I'm out of ideas.

Thank you all in advance.