IOS print pdf in A4 Format

I'm trying to print a PDF from my UIWebView, but the output PDF does not fill the A4 format. Why? How do I resolve that?

Any help will be greatly appreciated =)

If found the solution by avoid printing form IUWebView . I directly download the PDF in NSData format.

_data represente the NSData that i download by a request.

 if (_data) {
    UIPrintInteractionController *printController = [UIPrintInteractionController sharedPrintController];

    printController.delegate = self;

    UIPrintInfo *printInfo = [UIPrintInfo printInfo];
    printInfo.outputType = UIPrintInfoOutputGeneral;
    //printInfo.jobName = [path lastPathComponent];
    printInfo.duplex = UIPrintInfoDuplexLongEdge;
    printController.printInfo = printInfo;
    printController.showsPageRange = YES;
    printController.printingItem = _data;

    void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
        if (!completed && error) {
            NSLog(@"FAILED! due to error in domain %@ with error code %lu", error.domain, (long)error.code);
        }
    };

    [printController presentAnimated:YES completionHandler:completionHandler];
}