在 IOS 8 中跳过打印 UI？

Question

我可以找到一些代码来跳过打印 UI 并通过 Air 直接打印 Printer.But 代码不完整。代码如下，

 UIPrinterPickerController *printPicker = [UIPrinterPickerController printerPickerControllerWithInitiallySelectedPrinter:self.savedPrinter];
    [printPicker presentAnimated:YES completionHandler:
        ^(UIPrinterPickerController *printerPicker, BOOL userDidSelect, NSError *error) {
        if (userDidSelect) {
            self.savedPrinter = printerPicker.selectedPrinter;
        }
    }];

在此代码中，提到了self.savedPrinter。但是我怎样才能在这里得到保存的打印机。请给我一个完整的答案或示例解决方案。

Answer 1

我得到了我问的问题的答案above.Here是答案，

首先，你必须设置UIPrinterPickerController委托；即 UIPrinterPickerControllerDelegate 在您的 class.The 下一步是 select 来自 UIPrinterPickerController 的打印机。所以你必须在你的method.Here中添加一些代码我在我的设置中使用按钮操作viewcontroller。

- (IBAction)btnSettingsTapped:(id)sender
   {
      //Search printer method.
      [self searchForPrinters];
   }

     - (void) searchForPrinters
        {
           // For checking the ios version is greater than ios 7.Because skipping the   Printing UI is ony in ios8 and later.
          if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_7_1)
              {
                UIPrinterPickerController *printPicker = [UIPrinterPickerController printerPickerControllerWithInitiallySelectedPrinter:nil];
                                [printPicker presentAnimated:YES completionHandler:
                                 ^(UIPrinterPickerController *printerPicker, BOOL userDidSelect, NSError *error)
 {
    if (userDidSelect)
        {
          //User selected the item in the UIPrinterPickerController and got the printer details.

         [UIPrinterPickerController printerPickerControllerWithInitiallySelectedPrinter:printerPicker.selectedPrinter];

        //Here you will get the printer and printer details.ie,
        // printerPicker.selectedPrinter, printerPicker.selectedPrinter.displayName, printerPicker.selectedPrinter.URL etc. So you can display the printer name in your label text or button title.

        [btnSettingsPrint setTitle:printerPicker.selectedPrinter.displayName forState:UIControlStateNormal];

        NSURL *printerURL = printerPicker.selectedPrinter.URL;

        }
      }];
   }
}

如果您想在任何其他视图中设置打印功能，您必须在其他视图中存储打印机 URL 详细信息并从存储的 url 中获取打印机对象。

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:[printerURL absoluteString] forKey:@"yourKey"];
[defaults synchronize];

现在您可以通过使用保存的打印机调用 printToPrinter(:completionHandler:) 来告诉您的 UIPrintInteractionController 直接打印，而不是使用现有打印机之一 methods.You 可以在您的按钮操作中调用该方法。

//Printing item details passed to this method,
-(void)printYourItem :(NSData*)data
{
  if (NSFoundationVersionNumber > NSFoundationVersionNumber_iOS_7_1)
   {
     NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
     UIPrinter *currentPrinterObj = [UIPrinter printerWithURL:[NSURL URLWithString:[userDefault stringForKey:@"yourKey"]]];

    UIPrintInteractionController *controller = [UIPrintInteractionController sharedPrintController];

    if(currentPrinterObj)
       {
          [controller printToPrinter:currentPrinterObj completionHandler:^(UIPrintInteractionController *printController, BOOL completed, NSError *error)
              {
                if(completed)
                {
                } 
               else
               {
                  NSLog(@"FAILED! due to error in domain %@ with error code %u", error.domain, error.code);
               }
            }];
        }
   }
}

我想，这正是您需要的帮助。

在 IOS 8 中跳过打印 UI？

Skipping the Printing UI in IOS 8?

printing

objective-c

airprint

uiprintinteractioncntrler

ios8