iOS崩溃：由于未捕获异常原因终止应用程序：UIPopoverPresentationController应该有一个非nil的sourceView [英] iOS Crash: Terminating app due to uncaught exception reason: UIPopoverPresentationController should have a non-nil sourceView

问题描述

我需要帮助确定此崩溃。我检查stackoverflow的答案，但没有答案涉及到我的情况。这是我的代码。

I need help figuring this crash out. I checked stackoverflow for answers, but non of the answers relates to my situation. This is my code.

  - (void)addImagesActionSheetClickedButtonAtIndex:(NSInteger)buttonIndex
{
    // Cancel
    if (buttonIndex == 2) return;

    //Take picture
    if (buttonIndex == 0)
    {
        //Take picture
        isFromLibrary = NO;
        [self.imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
        [self.navigationController presentViewController:self.imagePicker animated:YES completion:NULL];
        return;
    }

    // Library picture
    if (buttonIndex == 1)
    {

    if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeSavedPhotosAlbum]) return;

    UIPopoverController *popup = [[UIPopoverController alloc] initWithContentViewController:self.imagePicker];
    [popup presentPopoverFromRect:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height/4, 0, 0)inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }
}

如果我点击按钮索引1并关闭 UIPopoverController ，然后点击按钮索引0拍摄我的应用程序崩溃的图片。

If I click button index 1 and dismiss the UIPopoverController then click button index 0 to take a picture my App crashes.

这是我的崩溃报告

'由于未捕获异常而终止应用程序' NSGenericException'，
reason：'UIPopoverPresentationController
（）应该在展示之前设置一个非nil
sourceView或barButtonItem。

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

任何建议或提示赞赏。如果我需要发布更多的代码，请让我知道。

Any suggestions or tips are appreciated. If I need to post more code, please let me know.

推荐答案

您需要有一个强大的引用 popup

You need to have a strong reference to popup

@property（nonatomic，strong）UIPopoverController * popup;

然后使用

 - (void)addImagesActionSheetClickedButtonAtIndex:(NSInteger)buttonIndex
{
    // Cancel
    if (buttonIndex == 2) return;

    //Take picture
    if (buttonIndex == 0)
    {
        //Take picture
        isFromLibrary = NO;
        [self.imagePicker setSourceType:UIImagePickerControllerSourceTypeCamera];
        [self.navigationController presentViewController:self.imagePicker animated:YES completion:NULL];
        return;
    }

    // Library picture
    if (buttonIndex == 1)
    {

    if (![UIImagePickerController isSourceTypeAvailable: UIImagePickerControllerSourceTypeSavedPhotosAlbum]) return;

        self.popup = [[UIPopoverController alloc] initWithContentViewController:self.imagePicker];
        [self.popup presentPopoverFromRect:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.height/4, 0, 0)inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }
}

并实现 UIPopoverControllerDelegate

And implement UIPopoverControllerDelegate

在

- (void)popoverControllerDidDismissPopover:(UIPopoverController *)popoverController{

    self.popup = nil;

}

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