iphone - UIPrintInteractionController 返回 UIPrintUnknownImageFormatError

Question

我正在尝试像这样打印通过 NSURLConnection 下载的 pdf 文档

    UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];
    NSData *PDFData = urlConnection.receivedData;
    if  (pic && [UIPrintInteractionController canPrintData:PDFData] ) {
        pic.printingItem = PDFData;
        ...
        [pic presentAnimated:YES completionHandler:completionHandler];
    }

尽管pdf很好并且可以由任何pdf查看器打开，但我在completionHandler中收到UIPrintUnknownImageFormatError。它有什么问题？

Answer 1

这个技巧有帮助：

    [receivedData writeToFile:filePath atomically:YES];
    NSData *PDFData = [NSData dataWithContentsOfFile:filePath];