What image size need to print a full A4 paper with UIPrintInteractionController?

Question

Printing logic look like this:

let printController = UIPrintInteractionController.shared
printController.printInfo = printInfo
printController.showsNumberOfCopies = false
printController.printingItem = image
printController.present(animated: true, completionHandler: nil)

Which size image needs to use all the A4 size paper?

Answer 1

According to the documentation the paper size chosen by locale.

When using UIPrintInfoOutputGeneral either US Letter size or A4 is picked, depending on user locale.