使用UIprintInteractionController显示页面方向选项

Question

如何使用UIPrintInteractionController显示页面方向选项？实际上我想用一个开关让用户选择他想要打印的方向。任何帮助都会很棒。我尝试使用UIPrintInteractionController的委托方法。

    - (UIViewController *)printInteractionControllerParentViewController:(UIPrintInteractionController *)printInteractionController
      {

        return nav;

      }

    - (void)printInteractionControllerWillPresentPrinterOptions:(UIPrintInteractionController *)printInteractionController
      {
        UISwitch * orietationSwitch = [[UISwitch alloc]initWithFrame:CGRectMake(50, 200,50, 21)];


        [nav.topViewController.view  addSubview:orietationSwitch];

       }