使用showsPrintPanel时将NSPrintOperation设置为false会导致打印时大小不同

Question

当使用NSPrintOperation并将showsPrintPanel设置为true时，视图会很好地打印，但是当我将属性设置为false时，视图不会正确打印，并且比纸张大：

func printBadge(printerName: String){
    let printingFrame = NSRect(x: 0, y: 0, width: AppManager.sharedInstance.badge.width, height: AppManager.sharedInstance.badge.height)
    let badgeView = BadgeView(frame: printingFrame)
    let printOperation = NSPrintOperation(view: badgeView)
    let printInfo = printOperation.printInfo

    printInfo.printer = NSPrinter(name: printerName)!
    printInfo.paperSize = NSSize(width: AppManager.sharedInstance.badge.width, height: AppManager.sharedInstance.badge.height)
    printInfo.horizontalPagination = .AutoPagination
    printInfo.verticalPagination = .AutoPagination
    printInfo.topMargin = 0
    printInfo.bottomMargin = 0
    printInfo.rightMargin = 0
    printInfo.leftMargin = 0
    printInfo.horizontallyCentered = true
    printInfo.verticallyCentered = true
    printOperation.showsPrintPanel = AppManager.sharedInstance.showsPrintPanel!
    printOperation.runOperation()
}

Answer 1

我最终解决了这个问题，NSPrintInfo.paperSize使用的是点而不是像素，所以我从毫米到像素的计算是不正确的(打印机设置是以毫米为单位，而不是像素或点)。

如果有人感兴趣，从毫米到点的数学计算是；

millimetres * 72 / 25.4