ios - Passing Image to another View Controller (Swift)

Question

I'm trying to move a user uploaded image from one UIImageView to another UIImageView on a different View Controller. I'm able to have the user upload an image and have it saved in the first UIImageView but after they press the "Post" button, the UIImageView on the next view controller remains blank.

Note: browsingImage is the name of the UIImageView on the second view controller (destination UIImageView)

Any help would be greatly appreciated!

@IBAction func cameraButton(sender: AnyObject) {

    addNewPicture()

}


func addNewPicture() {

    let picker = UIImagePickerController()
    picker.allowsEditing = true
    picker.delegate = self

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

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {

    postingImage.image = image
    self.dismissViewControllerAnimated(true, completion: nil)

}

@IBAction func postButton(sender: AnyObject) {

    performSegueWithIdentifier("toBrowsePage", sender: nil)


}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if segue.identifier == "toBrowsePage" {


        var itemToAdd = segue.destinationViewController as! ListPage

        itemToAdd.postingImage.image = browsingImage.image

    }

}

Answer 1

In prepare(for:) you can't access the @IBOutlets of the destination view controller because they haven't been set up yet. You should assign the image to a property of the destination view controller, and then move it into place in viewDidLoad():

In source view controller:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "toBrowsePage" {
        let dvc = segue.destination as! ListPage
        dvc.newImage = postingImage.image
    }
}

In destination view controller:

class ListPage: UIViewController {
    @IBOutlet weak var browsingImage: UIImageView!
    var newImage: UIImage!

    override func viewDidLoad() {
        super.viewDidLoad()
        browsingImage.image = newImage
    }
}