显示UIAlertController（actionsheet）iOS8时出现的运行时异常 [英] Runtime Exception coming when show UIAlertController(actionsheet) iOS8

问题描述

运行时异常即将到来。

此Bug仅在 iPad 设备中发生。

This Bug is only happening in iPad Devices.

我在使用UIAlertController时遇到了以下异常。

I'm getting bellow exception when using the UIAlertController.

* 由于未捕获的异常'NSGenericException'终止应用程序，原因：'UIPopoverPresentationController
（< _UIAlertControllerActionSheetRegularPresentationController：
0x15794370>）应该有一个非零的sourceView或barButtonItem设置为
在演示发生之前。'

* Terminating app due to uncaught exception 'NSGenericException', reason: 'UIPopoverPresentationController (<_UIAlertControllerActionSheetRegularPresentationController: 0x15794370>) should have a non-nil sourceView or barButtonItem set before the presentation occurs.'

我的代码显示ActionSheet如下

My Code for display ActionSheet as follows

     // Cancel Button
      UIAlertAction *actionCancel = [UIAlertAction
                                               actionWithTitle:NSLocalizedString(@"IDS_LABEL_CANCEL", nil)
                                               style:UIAlertActionStyleCancel handler:^(UIAlertAction *action) {
                                                   // cancel
                                                   //action handler
                                                   [self actionHandler:nil withTag:0 withButtonIndex:0];
                                               }];

      // print button
      UIAlertAction *actionPrint = [UIAlertAction
                                                      actionWithTitle:NSLocalizedString(@"IDS_LABEL_PRINT", nil)
                                                      style:UIAlertActionStyleDefault handler:^(UIAlertAction *action) {

                                                          //action handler
                                                          [self actionHandler:nil withTag:kAttachmentActionSheetTag withButtonIndex:0];         
                                             }];

    // Create action sheet
     UIAlertController *alertController = [UIAlertController
                                                      alertControllerWithTitle:nil message:nil
                                                      preferredStyle:UIAlertControllerStyleActionSheet];

[alertController addAction:actionCancel];
[alertController addAction:actionPrint];

     // show aciton sheet
     [self  presentViewController:alertController animated:YES
                                 completion:nil] ;

推荐答案

在iPad上，警报将显示为弹出窗口新的 UIPopoverPresentationController ，它要求您指定一个锚点使用以下三个属性之一呈现popover：

On iPad the alert will be displayed as a popover using the new UIPopoverPresentationController, it requires that you specify an anchor point for the presentation of the popover using one of the three following properties:

• barButtonItem


• sourceView


• sourceRect

• barButtonItem
• sourceView
• sourceRect

为了指定锚点，您需要获取对UIAlertController的UIPopoverPresentationController的引用，并设置其中一个属性，如下所示：

In order to specify the anchor point you will need to obtain a reference to the UIAlertController's UIPopoverPresentationController and set one of the properties as follows:

alertController.popoverPresentationController.sourceView = parentView;

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