Making UIViewController Image Pickerable

UIViewController+UIImagePickerController.swift

protocol ImagePickable {
    var imagePicker:UIImagePickerController { get set }
    func openPhotoLibrary()
}

var AssociatedObjectHandle: UInt8 = 0
extension UIViewController : ImagePickable, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    
    var imagePicker:UIImagePickerController {
        get {
            return objc_getAssociatedObject(self, &AssociatedObjectHandle) as! UIImagePickerController
        }
        set {
            objc_setAssociatedObject(self, &AssociatedObjectHandle, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
    
    func openPhotoLibrary() {
        imagePicker = UIImagePickerController()
        imagePicker.modalPresentationStyle = .CurrentContext
        imagePicker.sourceType = .PhotoLibrary
        imagePicker.delegate = self

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