我得到了同样的错误，在控制台怒吼的消息，同时打开相机。

’对一个没有被渲染的视图进行快照会导致一个空快照。确保你的视图在快照之前或屏幕更新后至少渲染过一次。”

对我来说，问题是在信息中的捆绑显示名称。plist文件。它是空的某种方式，我把我的应用程序名称在那里，现在它工作正常。我没有收到任何相机权限警报，因为空的Bundle显示名称。它阻止了视图的呈现。

问题不在于视图，而在于未经许可而呈现视图。你可以检查设置>隐私>相机，如果你的应用程序没有列出，问题可能是一样的。

我有一个UIAlertControllerStyleActionSheet给用户一个选项，用相机拍照或使用一个从库。

我在错误消息上尝试了一个符号断点

这表明错误是由演示期间实习生使用UICollectionView产生的

[self presentViewController:alert animated:YES completion:nil];

我通过在呈现前明确设置框架来解决这个问题

[alert setPreferredContentSize: alert.view.frame.size];

这里是完整的方法，是工作没有错误

-(void)showImageSourceAlertFromSender:(id)sender{
UIButton *senderButton = (UIButton*)sender;
UIAlertController *alert = [UIAlertController alertControllerWithTitle:nil message:nil preferredStyle:UIAlertControllerStyleActionSheet];
UIAlertAction *cameraAction = [UIAlertAction actionWithTitle:@"Camera" style:UIAlertActionStyleDefault
                                                     handler:^(UIAlertAction *action) {
                                                         [self takePhoto];
                                                     }];
UIAlertAction *libraryAction = [UIAlertAction actionWithTitle:@"Library" style:UIAlertActionStyleDefault
                                                      handler:^(UIAlertAction *action) {
                                                          [self selectPhotoFromLibraryFromSender:sender];
                                                      }];
[alert addAction:cameraAction];
[alert addAction:libraryAction];
alert.popoverPresentationController.delegate = self;
alert.popoverPresentationController.sourceRect = senderButton.frame;
alert.popoverPresentationController.sourceView = self.view;

[alert setPreferredContentSize: alert.view.frame.size];

[self presentViewController:alert animated:YES completion:^(){
}];}

我在调用UIImagePickerController presentViewController后遇到了这个:从回调到UIAlertView委托。我通过推presentViewController解决了这个问题:使用dispatch_async调用当前执行跟踪。

- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex
{
    dispatch_async(dispatch_get_main_queue(), ^{
        UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
        imagePickerController.delegate = self;

        if (buttonIndex == 1)
            imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
        else
            imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

        [self presentViewController: imagePickerController
                           animated: YES
                         completion: nil];
    });
}

我遇到过这个问题。当我们调用相机并释放视图时就产生了这个问题。举个例子，调用一个相机并在viewDidDisappear方法中设置视图为nil，这个错误将会出现，因为没有相机事件的回调。对于这个错误，也要确认一下。

如果我们使用UIImagePickerController作为属性，那么这个警告将会消失。xcode假设我们没有使用UIImagePickerController的结果，如果我们在一个函数中实例化UIImagePickerController。

I don't have enough reputation points to comment on @greg's answer above, so will add my observations here. I have a Swift project for both iPad and iPhone. I have a method inside my main view controller (relevant bit below). When I test this on a phone, everything works properly and no warnings are generated. When I run it on an iPad, everything works properly but I see the warning about snapshotting the view. The interesting bit, however, is that when I run on an iPad without using the popover controller, everything works properly with no warning. Unfortunately, Apple mandates that the image picker must be used within a popover on iPad, if the camera is not being used.

    dispatch_async(dispatch_get_main_queue(), {
        let imagePicker: UIImagePickerController = UIImagePickerController();
        imagePicker.sourceType = UIImagePickerControllerSourceType.SavedPhotosAlbum;
        imagePicker.mediaTypes = [kUTTypeImage];
        imagePicker.allowsEditing = false;
        imagePicker.delegate = self;

        if(UIDevice.currentDevice().userInterfaceIdiom == .Pad){ // on a tablet, the image picker is supposed to be in a popover
            let popRect: CGRect = buttonRect;
            let popover: UIPopoverController = UIPopoverController(contentViewController: imagePicker);
            popover.presentPopoverFromRect(popRect, inView: self.view, permittedArrowDirections: UIPopoverArrowDirection.Up, animated: true);
        }else{
            self.presentViewController(imagePicker, animated: true, completion: nil);
        }
    });