ListIconController.swift

class ListIconController: UIViewController {
  fileprivate func setupIconView() {
    //..
    NotificationCenter.default.addObserver(self, selector: #selector(handleChangeColor), name: NSNotification.Name(rawValue: "colorRefersh"), object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(handleChangeIcon), name: Notification.Name(rawValue: "iconRefresh"), object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(handleChangeImage), name: Notification.Name(rawValue: "iconImage"), object: nil)
  }
  
  @IBAction func handleDone(_ sender: Any) {
    let renderer = UIGraphicsImageRenderer(size: iconView.bounds.size)
    let image = renderer.image { ctx in
      iconView.drawHierarchy(in: iconView.bounds, afterScreenUpdates: true)
    }
    let finalIconDict: [String: UIImage] = ["finalIcon": image]
    NotificationCenter.default.post(name: NSNotification.Name("finalIcon"), object: nil, userInfo: finalIconDict)
    if list != nil {
      let context = CoreDataManager.shared.persistentContainer.viewContext
      let imageData = image.jpegData(compressionQuality: 0.8)
      list?.setValue(imageData, forKey: "imageData")
      do {
        try context.save()
        navigationController?.popViewController(animated: true)
      } catch let err {
        print(err)
      }
    } else {
      navigationController?.popViewController(animated: true)
    }
  }
  
  @objc private func handleChangeColor(notification:  Notification) {
    guard let colorDict = notification.userInfo else { return }
    guard let colors = colorDict["colorDict"] as? [UIColor] else { return }
    firstColorData = colors[0].encode()
    secondColorData = colors[1].encode()
    iconView.backgroundImage.image = nil
    setIconGradient(colorOne: colors[0], colorTwo: colors[1])
  }
  
  @objc private func handleChangeIcon(notification: Notification) {
    guard let iconDict = notification.userInfo else { return }
    guard let image = iconDict["iconDict"] as? UIImage else { return }
    iconView.backgroundImage.image = nil
    iconView.image.image = image
    iconView.image.image = iconView.image.image?.withRenderingMode(.alwaysTemplate)
    iconView.image.tintColor = .white
    iconView.contentMode = .scaleAspectFit
  }
  
  @objc private func handleChangeImage(notification: Notification) {
    guard let iconDict = notification.userInfo else { return }
    guard let image = iconDict["iconDict"] as? UIImage else { return }
    isImage = true
    iconView.image.image = nil
    iconView.backgroundImage.image = image
  }  
  //.. 
}