打印预览中不显示条形码。(目标C)

Question

我有一个包含一些条形码的pdf。在WKWebView中，pdf预览效果良好(显示的是条形码)。但是在打印预览中条形码是不会出现的。

这是我正在使用的代码。

#define kPrintingPerPageEdgeInsets UIEdgeInsetsMake(60, 40, 60, 40)

- (void)presentPrintInteractionControllerWithFormatter:(UIPrintFormatter *)printFormatter
                                               jobName:(NSString *)jobName
                                           contentType:(PrintingContentType)contentType
                              actionSheetBarButtonItem:(UIBarButtonItem *)barButtonItem
                                 printInfoOrientation:(UIPrintInfoOrientation) printOrientation
{
    UIPrintInteractionController *printInteractionController = [[self class] createPrintInteractionControllerWithJobName:jobName];
    printInteractionController.printFormatter = printFormatter;
    printInteractionController.printFormatter.perPageContentInsets = kPrintingPerPageEdgeInsets;
    printInteractionController.printInfo.orientation = printOrientation;
    [self presentPrintInteractionController:printInteractionController
                                contentType:contentType
                              barButtonItem:barButtonItem];
}

+ (UIPrintInteractionController *)createPrintInteractionControllerWithJobName:(NSString *)jobName
{
    UIPrintInteractionController *printInteractionController = [UIPrintInteractionController sharedPrintController];
    printInteractionController.printingItem = nil;
    printInteractionController.printFormatter = nil;

    UIPrintInfo *printInfo = [UIPrintInfo printInfo];
    printInfo.outputType = UIPrintInfoOutputGeneral;
    printInfo.jobName = jobName;
    printInteractionController.printInfo = printInfo;

    return printInteractionController;
}

Answer 1

我已经自己找出了解决方案。我们可以使用printInteractionController的PrintingItem属性来打印文档，而不是使用printFormatter。

printInteractionController.printFormatter = nil;
printInteractionController.printingItem = pdfData;

pdfData是与pdf相关的NSData。