imagePickerController delegate not called,Swift - ios

Question

I have a profile picture which also acts as a button, when the person clicks the picture the image selector shows up and they can choose the picture they want to use as their profile picture, but the imagePickerController is not being called, and the Parse db image file is not being called. Why is this happening, how can I fix it?
class ProfileView: UIViewController, UIImagePickerControllerDelegate {
func userchange(sender: AnyObject){
if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum){
// imagePicker.delegate = self
imagePicker.allowsEditing = false
imagePicker.sourceType = .PhotoLibrary
presentViewController(imagePicker, animated: true, completion: nil)
}
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
let user = PFUser.currentUser()
let image = info[UIImagePickerControllerOriginalImage] as! UIImage
let imageData = UIImageJPEGRepresentation(image, 0.05)
let imageFile = PFFile(name:"image.jpg", data:imageData!)
user!["ProPic"] = imageFile;
imageFile.save()
//NOTHING IS BEING PRINTED
print("called")
user!.saveInBackgroundWithBlock(nil)
self.dismissViewControllerAnimated(true, completion: nil)
}
}
}

Answer 1

in swift 2.0 and onwards if you using any delegates for example UIImagePickerControllerDelegate , you need to compulsory implement the delegate methods , else dont use or dont add in your viewcontroller, this is the concept , now follow this
some example
Step-1
add UIImagePickerControllerDelegate, UINavigationControllerDelegate in your view Controller
class ViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
#IBOutlet var imageView: UIImageView!
let imagePicker = UIImagePickerController()
Step-2
override func viewDidLoad() {
super.viewDidLoad()
imagePicker.delegate = self // Its Manotary
}
Step-3
// Present the Image picker controller
#IBAction func loadImageButtonTapped(sender: UIButton) {
imagePicker.allowsEditing = false
imagePicker.sourceType = .PhotoLibrary
presentViewController(imagePicker, animated: true, completion: nil)
}
Step-4
// call the delegate method for pick the image
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
imageView.contentMode = .ScaleAspectFit
imageView.image = pickedImage
}
dismissViewControllerAnimated(true, completion: nil)
}
Step-5
// finally dismiss the Imagepicker controller
func imagePickerControllerDidCancel(picker: UIImagePickerController) {
dismissViewControllerAnimated(true, completion: nil)
}