如何将图片分配给UIImageView（Swift 3）

Question

I'm trying to add an image from the gallery to the new ViewController, but get an error

Creating an image format with an unknown type is an error fatal error: unexpectedly found nil while unwrapping an Optional value

Code:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
        if let im = info[UIImagePickerControllerOriginalImage] as? UIImage {
            let vc = self.storyboard?.instantiateViewController(withIdentifier: "editImage") as! EditImageViewController
            vc.imageView.image = im
            self.present(vc, animated: true, completion: nil)
        } else {
            print("Something went wrong")
    }
    imagePicker.dismiss(animated: true, completion: nil)
}

What's my mistake?

Answer 1

Your EditImageViewController.imageView is nil. To pass image from outside, you need to add UIImage property to EditImageViewController .

To assign that image to UIImageView , use viewDidLoad()

Something like this:

class EditImageViewController: UIViewController {

    @IBOutlet weak var imageView: UIImageView!
    var imageToAdd: UIImage?

    override func viewDidLoad() {
        super.viewDidLoad()
        self.imageView.image = imageToAdd
    }
}

To pass image to new controller, just set imageToAdd , so vc.imageView.image = im becomes vc.imageToAdd = im