UIImagePicker.swift

extension ViewController: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    func presentImagePicker(allowingEditing: Bool) {
        if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.photoLibrary){
            let imagePickerController = UIImagePickerController()
            imagePickerController.delegate = self
            imagePickerController.sourceType = UIImagePickerControllerSourceType.photoLibrary;
            imagePickerController.allowsEditing = allowingEditing
            self.present(imagePickerController, animated: true, completion: nil)
        }
    }
    
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info:[String : Any]) {
        if info.keys.contains(UIImagePickerControllerEditedImage) {
            var image = info[UIImagePickerControllerEditedImage] as? UIImage
        } else {
            var image = info[UIImagePickerControllerOriginalImage] as? UIImage
        }
        update(with: image)
        self.dismiss(animated: true, completion: nil)
    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
        self.dismiss(animated: true, completion: nil)
    }
}