Trying to add functionality to be able to air Print a UITableView - ios

Question

I have a (to-do style) list app. the data is laid out in a diffable dataSource tableview with custom cells. I have a functioning dropdown menu and I'm trying to add a print button so the user can print out the list if they'd like (seems standard in a lot of list apps).
So far I have the following in the button's action:
let printController = UIPrintInteractionController.shared
printController.delegate = self
let printInfo = UIPrintInfo(dictionary: nil)
printInfo.outputType = .general
printInfo.jobName = "Print TableView"
printController.printInfo = printInfo
let tableViewPDF = self?.tableView.exportAsPdfFromTable()
printController.printingItem = tableViewPDF
let formatter = UIPrintFormatter()
formatter.perPageContentInsets = UIEdgeInsets(top: 50, left: 50, bottom: 50, right: 50)
printController.printFormatter = formatter
printController.present(animated: true, completionHandler: nil)
and the delegate:
extension ListTableViewController: UIPrintInteractionControllerDelegate {
func printInteractionControllerParentViewController(_ printInteractionController: UIPrintInteractionController) -> UIViewController? {
return self
}
}
As you can see I am trying to convert the tableview into a PDF and print that (something else might be better perhaps?). The .exportAsPdfFromTable() method on tableView is a UITableView extension as follows:
extension UITableView {
// Export pdf from UITableView and save pdf in drectory and return pdf file path
func exportAsPdfFromTable() -> String {
let originalBounds = self.bounds
self.bounds = CGRect(x:originalBounds.origin.x, y: originalBounds.origin.y, width: self.contentSize.width, height: self.contentSize.height)
let pdfPageFrame = CGRect(x: 0, y: 0, width: self.bounds.size.width, height: self.contentSize.height)
let pdfData = NSMutableData()
UIGraphicsBeginPDFContextToData(pdfData, pdfPageFrame, nil)
UIGraphicsBeginPDFPageWithInfo(pdfPageFrame, nil)
guard let pdfContext = UIGraphicsGetCurrentContext() else { return "" }
self.layer.render(in: pdfContext)
UIGraphicsEndPDFContext()
self.bounds = originalBounds
// Save pdf data
return self.saveTablePdf(data: pdfData)
}
// Save pdf file in document directory
func saveTablePdf(data: NSMutableData) -> String {
let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
let docDirectoryPath = paths[0]
let pdfPath = docDirectoryPath.appendingPathComponent("tablePdf.pdf")
if data.write(to: pdfPath, atomically: true) {
return pdfPath.path
} else {
return ""
}
}
}
The result is the print controller being presented with a blank page. Any ideas on what I'm missing?