ios - 使用 AirPrint 打印 Pdf 会导致输出较小

Question

我尝试使用加载到 UIWevView 中的 UIPrintInteractionController 打印 pdf。好消息是我可以打印，坏消息是打印的输出太小。

any help would be appreciated :)


- (IBACTION) printPDF {


    if ((!_webView)) return;
    UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];
    void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
    ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
        if(!completed && error){
            NSLog(@"FAILED! due to error in domain %@ with error code %ld",
                  error.domain, (long)error.code);
        }
    };
    UIPrintInfo *printInfo = [UIPrintInfo printInfo];
    printInfo.outputType = UIPrintInfoOutputGeneral;
    printInfo.duplex = UIPrintInfoDuplexLongEdge;
    controller.printInfo = printInfo;
    controller.showsPageRange = YES;
    _webView.scalesPageToFit = NO;
    UIViewPrintFormatter *viewFormatter = [_webView viewPrintFormatter];
    viewFormatter.startPage = 0;
     controller.printFormatter = viewFormatter;



    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
        /*        [controller presentFromBarButtonItem:printButton animated:YES completionHandler:completionHandler]; */
    }else
        [controller presentAnimated:YES completionHandler:completionHandler];
}

输出:

Answer 1

根据@crescendolls 的回复，这里有一段完整的代码，用于将 webview 中的 PDF 转换为数据，并相应地进行打印。

-(void)printReport {
    UIPrintInfo *pi = [UIPrintInfo printInfo];
    pi.outputType = UIPrintInfoOutputGeneral;
    pi.jobName = webView.request.URL.absoluteString;
    pi.orientation = UIPrintInfoOrientationPortrait;
    pi.duplex = UIPrintInfoDuplexLongEdge;

    UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];
    pic.printInfo = pi;
    pic.showsPageRange = YES;

    //does not display PDF appropriately
    //pic.printFormatter = webView.viewPrintFormatter;

    //does display PDF appropriately
    NSCachedURLResponse* webResponse = [[NSURLCache sharedURLCache] cachedResponseForRequest:[webView request]];
    NSData* webData = [webResponse data];
    pic.printingItem = webData;

    [pic presentFromBarButtonItem:self.printBarButton animated:YES completionHandler:^(UIPrintInteractionController *pic2, BOOL completed, NSError *error) {
        // indicate done or error
    }];
}