Set background of another view in swift - ios

Question

I'd like to let the user chose a background for the main view of the app.
I'd like to know how I can do that for another view, even if the app is killed.
I thought about saving the path of the image in Userdefaults and then get it from the main view, but I'm not able to set the background from an asset URL. Is there a way to do this ? Or a better way maybe ?
Here is what I've done so far:
#IBOutlet weak var imageView: UIImageView!
var imagePicker = UIImagePickerController()
#IBAction func background(_ sender: Any) {
self.imagePicker.allowsEditing = false
self.imagePicker.sourceType = .savedPhotosAlbum
imagePicker.modalPresentationStyle = .overCurrentContext
self.present(imagePicker, animated: true, completion: nil)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let pickedImage = info[UIImagePickerControllerOriginalImage] as? UIImage {
self.imageView.contentMode = .scaleAspectFit
let imageUrl = info[UIImagePickerControllerReferenceURL] as! URL
UserDefaults.standard.set(imageUrl, forKey: "background")
imageView.image = pickedImage
}
dismiss(animated: true, completion: nil)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
self.imagePicker = UIImagePickerController()
dismiss(animated: true, completion: nil)
}

Answer 1

How about loading URL from defaults in viewDidLoad() and then call setImageFromURL? Of course you have to set the image to your ImageView
func setImageFromURl(stringImageUrl url: String){
if let url = NSURL(string: url) {
if let data = NSData(contentsOf: url as URL) {
self.image = UIImage(data: data as Data)
}
}
}