Just updated to XCode 14 this morning and am receiving this strange warning

Result of call to function returning 'Bool' is unused

when working with the present function for printing via AirPrint. This was not an issue in XCode 13 and I cannot see any reason it's happening now, except if something changed in Swift 6.

Hoping someone knows the answer.

Here's the function:

/// Prints the PDF file using airprint
        func printPDF() {
            let pdfFileURL = FileManager.default.temporaryDirectory.appendingPathComponent(
                "Filename.pdf"
            )
            let printController = UIPrintInteractionController.shared
            let printInfo = UIPrintInfo(dictionary: nil)

            printInfo.jobName = "Print PDF"
            printInfo.outputType = .general

            printController.printInfo = printInfo
            printController.printingItem = pdfFileURL
            printController.present(animated: true) { (_, isPrinted, error) in // <-- Result of call to function returning 'Bool' is unused
                if error == nil {
                    if isPrinted {
                        print("Print Success")
                    } else {
                        print("Print Failed: \(error?.localizedDescription ?? "No Error")")
                    }
                }
            }
        } // End Func

CodePudding user response：

According to the documentation the signature of the function is:

func present(animated: Bool, completionHandler: UIPrintInteractionController.CompletionHandler?) -> Bool

if you don´t need the returned value use:

let _ = printController.present(animated: true) { (_, isPrinted, error) in