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

Question

My var:

@IBOutlet weak var imageView: UIImageView!

Take photo function:

func takePhoto(){
        let picker = UIImagePickerController()

        picker.delegate = self
        picker.sourceType = .Camera

        presentViewController(picker, animated: true, completion: nil)
    }

Error message:

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

Any ideas?

Answer 1

I have had the same problem - I have two options once I have called the VC - From Photos or Selfie - and when I select Selfie i.e. camera Xcode prints that message but not ion I select Photos - so my guess is its a bug in the camera app. It has never crashed my app so I ignore it Code:

@IBAction func openCameraButton(sender: AnyObject) {
    if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera) == true {
        camera = true
        imagePicker.delegate = self
        imagePicker.sourceType = .Camera
        imagePicker.allowsEditing = false
        self.presentViewController(imagePicker, animated: true, completion: nil)
    }else{
        noCamera()

    }
}

Answer 2

Make sure you have:

super.viewDidLoad()

in your viewDidLoad func.

Answer 3

put your self.presentViewController or your self.navigationController?.showViewController inside dispatch_async(dispatch_get_main_queue()) {

dispatch_async(dispatch_get_main_queue()) {
  self.presentViewController(imagePicker, animated: true, completion: nil)
}