iOS8 Snapshotting a view that has not been rendered results in an empty snapshot

Question

So I know this has been answered a number of times before, but I have yet to come across a solution that works for me.

The odd thing too, is that the first time I present the Camera from a UIPickerController it works fine, exactly as intended. But then if I open it again it shows just a black screen with the Camera controls ("Cancel" button and white take picture button).

Any help suppressing this error would be greatly appreciated, or even just some confirmation that this is a bug and I just have to wait for Apple to fix it would be a great help!

Thanks all :)

(P.S. I'm running on an iPhone 6 Plus using iOS 8.1)

EDIT: Code (I'm using Xamarin and c#)

public void ShowPhotoTaker (UIViewController vc)
    {
        UIImagePickerController picker = new UIImagePickerController ();
        picker.SourceType = UIImagePickerControllerSourceType.Camera;

        picker.FinishedPickingMedia += (object sender, 
            picker.DismissViewController(true, null);
        };

        picker.Canceled += (object sender, EventArgs e) => {
            picker.DismissViewController(true, null);
        };

        vc.PresentViewController (picker, true, null);
    }

And this is the exact error I get when calling this method

Snapshotting a view that has not been rendered results in an empty snapshot. Ensure your view has been rendered at least once before snapshotting or snapshot after screen updates.

Show us some code please? – Sergey Grischyov Nov 12 '14 at 17:03 — Sergey Grischyov, Nov 12 '14 at 17:03
Edited above with the code I'm using. – julianwyz Nov 12 '14 at 17:05 — julianwyz, Nov 12 '14 at 17:05

score 1 · Accepted Answer · answered Apr 01 '15 at 12:21

1

I have had this error for a while too. I've contacted Xamarin Support, and they've told me that this is an error with iOS 8 and higher. There's no solution for this, other than waiting for some bugfix to roll out for iOS development or perhaps Xamarin itself. A workaround might be to set the build SDK to an earlier version and clean + rebuild your application.

answered Apr 01 '15 at 12:21

Magicbjørn

619
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Yeah that is what I figured out. Fortunately I'm not seeing this error quite as frequently as before, so perhaps it has been somewhat fixed. Thanks for your help! – julianwyz Apr 01 '15 at 12:33

score 0 · Answer 2 · answered Sep 08 '15 at 19:21

Snapshotting a view that has not been rendered results in an empty snapshot same error.

This is definitely a bug and you can find this in apple developer forums as well.

I have tried to avoid this error using lot of other answers on stack overflow but could not fix this issue. However using this I could some how not get this error, i would not call this a fix, But give it a try and let me know if it had fixed the issue.
Dismiss the view controller using the Grand Central Dispatch async from the main queue fixed the issue for me.

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {

// Code to handle the image data 

dispatch_async(dispatch_get_main_queue(), ^{
    [self dismissViewControllerAnimated:YES completion:nil];
});
}
-(void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
dispatch_async(dispatch_get_main_queue(), ^{
[self dismissViewControllerAnimated:YES completion:nil];

});

}

iOS8 Snapshotting a view that has not been rendered results in an empty snapshot

2 Answers2

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