如何从firebase swift 3缓存listview中的图像

Question

我正在努力理解如何在我从Listbase中获取的列表视图中缓存图像。我在网上查了一下，大多数解决方案与我写的代码风格有些不同，所以发现很难转移。任何解决方案都会对我在下面提供的课程感激不尽。

class StaffListTableViewCell: UITableViewCell {

    @IBOutlet weak var staffFirstAndLastName: UILabel!

    @IBOutlet weak var JobTitle: UILabel!

    @IBOutlet weak var staffImageView: UIImageView!

    var databaseRef: DatabaseReference {
        return Database.database().reference()
    }

    var storageRef: Storage {
        return Storage.storage()
    }

    override func awakeFromNib() {
        super.awakeFromNib()
        // Initialization code
    }

    func configureCell(teacher: StaffListsSTRUCT) {


        //this line of code helps sets the imageviews in the list view to nil before loading. 
        self.staffImageView.image = nil

        self.staffFirstAndLastName.text = teacher.staffName
        self.JobTitle.text = teacher.staffJobTitle

        let imageURL = teacher.staffImageViewString!

        self.storageRef.reference(forURL: imageURL).getData(maxSize: 1 * 1024 * 1024, completion: { (imgData,
            error) in

            if error == nil {
                DispatchQueue.main.async {
                    if let data = imgData {
                        self.staffImageView.image = UIImage(data: data)

                    }

                }
            } else {

                print(error!.localizedDescription)
            }

        })

    }


}