Passing class via delegate : property not updated - swift

Question

don't understand why I didn't get my class property updated (imageData property).
simple example, 2 view controllers embed in navigation controller (important for me):
first one : ViewController with an imageView and a button to the second view controller (via segue)
class ViewController: UIViewController, choosePicVCDelegate {
#IBOutlet weak var imageView: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
self.imageView.clipsToBounds = true
}
func goodPic(vc: choosePicViewController) {
if let data = vc.imageData {
let image = UIImage(data: data)
self.imageView.image = image
}
vc.navigationController?.popViewControllerAnimated(true)
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
let vc = segue.destinationViewController as! choosePicViewController
vc.delegate = self
}
}
second one : choosePicViewController with an imagePicker to choose the image to display in the first ViewController. 2 buttons: one to choose the image, the other to go back to the first view controller with the delegate..
protocol choosePicVCDelegate {
func goodPic(vc: choosePicViewController)
}
class choosePicViewController: UIViewController {
var delegate: choosePicVCDelegate?
let imagePicker = UIImagePickerController()
var imageData: NSData?
#IBAction func back(sender: UIButton) {
delegate?.goodPic(self)
}
#IBAction func coverPick(sender: UIButton) {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) {
imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary;
imagePicker.allowsEditing = false
self.presentViewController(imagePicker, animated: true, completion: nil)
}
}
}
extension choosePicViewController: UIImagePickerControllerDelegate {
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
self.imageData = UIImageJPEGRepresentation(image, 1.0)
dismissViewControllerAnimated(true, completion: nil)
}
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
dismissViewControllerAnimated(true, completion: nil)
}
}
always got nil from imageData property, don't understand why.

Answer 1

I think the problem is your extension, i didn't understand why use extension in this case, whatever. Try do it.
You need set delegate from imagePicker.delegate = self, because with this you can listener the UIImagePickerController delegate. I believe with this you resolve.
protocol choosePicVCDelegate {
func goodPic(vc: choosePicViewController)
}
class choosePicViewController: UIViewController, UIImagePickerControllerDelegate {
var delegate: choosePicVCDelegate?
let imagePicker = UIImagePickerController()
var imageData: NSData?
override func viewWillAppear(animated: Bool) {
imagePicker.delegate = self;
}
override func viewDidDisappear(animated: Bool) {
imagePicker.delegate = nil;
}
#IBAction func back(sender: UIButton) {
delegate?.goodPic(self)
}
#IBAction func coverPick(sender: UIButton) {
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) {
imagePicker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary;
imagePicker.allowsEditing = false
self.presentViewController(imagePicker, animated: true, completion: nil)
}
}
//Delegates from UIImagePickerControllerDelegate
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
if let img = info[UIImagePickerControllerOriginalImage] as? UIImage{
self.imageData = UIImageJPEGRepresentation(img, 1.0)
delegate?.goodPic(self)
dismissViewControllerAnimated(true, completion: nil)
}
}
}
Hope help you!