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我正在尝试对我的 UIWebView (iOS8.1) 的内容进行 AirPrint，但我遇到了一个异常，没有详细说明问题所在。如果我在 Xcode 6.1 中将“全局断点状态”切换为 OFF，那么它偶尔会打印，尽管有时页面是空白的。我还在使用最新安装的 Printopia 打印到 iMac。

是否还有其他人在 iOS8 中遇到 AirPrinting 问题？下面的代码是否存在可能导致此问题的问题？

// AirPrint 功能
-(void)printBid {
 if ([UIPrintInteractionController isPrintingAvailable]) { // 检查我们是否可以打印



// 使用 UIPrintInteractionController 打印网页视图内容
   // 这会在全局断点状态设置为 On 时生成异常，但在 Off 时似乎工作


    UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];
    //pic.delegate = self;
    UIPrintInfo *printInfo = [UIPrintInfo printInfo];
    printInfo.outputType = UIPrintInfoOutputGeneral;
    printInfo.jobName = @"QuickBids";
    printInfo.duplex = UIPrintInfoDuplexLongEdge;
    pic.printInfo = printInfo;
    pic.showsPageRange = YES;


    UIViewPrintFormatter *formatter = [bidPreviewWebView viewPrintFormatter];
    pic.printFormatter = formatter;


    UIPrintInteractionCompletionHandler completionHandler =
    ^(UIPrintInteractionController *printController, BOOL completed,
      NSError *error) {
        if(!completed && error){
            NSLog(@"Print failed - domain: %@ error code %u", error.domain,
                 error.code);
        }
    };



    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {     // The device is an iPad running iPhone 3.2 or later.


        // iOS 8 Issue on iPad - As a workaround, I recommend delaying the presentation until the next runloop, using the following method:
        // http://stackoverflow.com/questions/24854802/presenting-a-view-controller-modally-from-an-action-sheets-delegate-in-ios8
        dispatch_async(dispatch_get_main_queue(), ^ {
            [pic presentFromBarButtonItem:shareButton animated:YES completionHandler:completionHandler];
        });


    }else { // The device is an iPhone or iPod touch.
        dispatch_async(dispatch_get_main_queue(), ^ {
            [pic presentAnimated:YES completionHandler:completionHandler];
        });
    }




}else {    // we can't print so show an alert


    // show simple alert
    UIAlertController *alertController = [UIAlertController
                                          alertControllerWithTitle:@"Printing Unavailable"
                                          message:@"You cannot print from this device."
                                          preferredStyle:UIAlertControllerStyleAlert];


    UIAlertAction *okAction = [UIAlertAction
                               actionWithTitle:NSLocalizedString(@"OK", @"OK action")
                               style:UIAlertActionStyleDefault
                               handler:^(UIAlertAction *action)
                               {
                                   NSLog(@"OK action");
                               }];


    [alertController addAction:okAction];
    [self presentViewController:alertController animated:YES completion:nil];


}

}

提前感谢您的帮助。

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