class AccountSettings: UITableViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate{

@IBOutlet weak var profileImage: UIImageView!
var imageRef: StorageReference{
    return Storage.storage().reference().child("profile_images")
}

let cache = NSCache<NSString, UIImage>()
var activityIndicator = UIActivityIndicatorView()

override func viewDidLoad() {
    activityIndicator = UIActivityIndicatorView(activityIndicatorStyle: .gray)
    activityIndicator.frame = CGRect(x: 0, y: 0, width: 46, height: 46)
    activityIndicator.hidesWhenStopped = true

    profileImage.addSubview(activityIndicator)
    activityIndicator.startAnimating()


    if let image = cache.object(forKey: "(UserDefaults.standard.string(forKey: "unique_id")!).jpg" as NSString){
        profileImage.image = image
    }else{
        retrieveCurrentProfileImg()
    }

}

func retrieveCurrentProfileImg(){
    let downloadImageRef = imageRef.child("(UserDefaults.standard.string(forKey: "unique_id")!).jpg")

    let downloadTask = downloadImageRef.getData(maxSize: 1024*1024*12) { (data, error) in
        if let data = data{
            let image = UIImage(data: data)
            self.profileImage.image = image
            self.cache.setObject(image!, forKey: "(UserDefaults.standard.string(forKey: "unique_id")!).jpg" as NSString)
            self.activityIndicator.stopAnimating()
        }

        print(error ?? "No error")

    }
    downloadTask.observe(.progress) { (snapshot) in

    }
    downloadTask.resume()

}