不能在其他类文件中快速使用Func

Question

我有一个要在其他课程文件中使用的功能

我声明函子在外部，该方法我想在其他两个类文件中使用它，但是它不起作用，是我错了吗？

class BlurEffect{
    var blurEffectView: UIVisualEffectView!

    func blurEffectAnimation(isBlur: Bool, view: UIView) {

        if isBlur {
            let blurEffect = UIBlurEffect(style: .light)
            blurEffectView = UIVisualEffectView(effect: blurEffect)
            blurEffectView.frame = view.bounds
            blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
            view.addSubview(blurEffectView)

            UIView.animate(withDuration: 1.0){
                self.blurEffectView.alpha = 0.4
                self.blurEffectView.transform = CGAffineTransform.identity
            }
        } else {
            blurEffectView.removeFromSuperview()
            blurEffectView.effect = nil
        }

    }   
}

我在此类别中声明了BlurEffect方法

class ItemCardTableViewController: UITableViewController  {

    var blurEffectView: BlurEffect?

    @objc func addNewItem() {
        blurEffectView?.blurEffectAnimation(isBlur: true)

        let addAlert = UIAlertController(title: "", message: "", preferredStyle: .alert)
        addAlert.addTextField { (textfied: UITextField) in
            textfied.addTarget(addAlert, action: #selector(addAlert.textDidChanged), for: .editingChanged)
        }

        let confirm = UIAlertAction(title: "ok", style: .default) { (action: UIAlertAction) in

            guard let title = addAlert.textFields?.first?.text else { return }

            let newItem = ItemCard(title: title, isFinish: false)
            self.dataManager.items.append(newItem)

            let indexPath = IndexPath(row: self.itemCardTableView.numberOfRows(inSection: 0), section: 0)
            self.itemCardTableView.insertRows(at: [indexPath], with: .left)
            self.blurEffectView?.blurEffectAnimation(isBlur: false)
        }

        let cancel = UIAlertAction(title: "cancle", style: .cancel) { _ in self.blurEffectView?.blurEffectAnimation(isBlur: false)}

        addAlert.addAction(cancel)
        confirm.isEnabled = false
        addAlert.addAction(confirm)
        self.present(addAlert, animated: true, completion: nil)
    }
}

blurEffectView?.blurEffectAnimation(isBlur: true)不起作用