title: UIImageJPEGRepresentation has been replaced by instance method UIImage.jpegData(compressionQuality:)
body: <p>I've tried to upload a photo to Firebase but it's giving me this error. It was working before Xcode 10. I'm getting this error:</p>
  
  <blockquote>
    <p>'UIImageJPEGRepresentation' has been replaced by instance method 'UIImage.jpegData(compressionQuality:)'</p>
  </blockquote>
  
  <p>and I don't know how to use this function.</p>
  
  <pre><code>import UIKit
  import Firebase
  
  class SignUpViewController:UIViewController {
      @IBOutlet weak var profileImageView: UIImageView!
      @IBOutlet weak var tapToChangeProfileButton: UIButton!
  
      var continueButton:RoundedWhiteButton!
      var imagePicker:UIImagePickerController!
  
      override func viewDidLoad() {
          super.viewDidLoad()
  
            continueButton.addTarget(self, action: #selector(handleSignUp), for: 
            .touchUpInside)
          let imageTap = UITapGestureRecognizer(target: self, action: 
          #selector(openImagePicker))
          profileImageView.isUserInteractionEnabled = true
          profileImageView.addGestureRecognizer(imageTap)
          profileImageView.layer.cornerRadius = profileImageView.bounds.height / 2
          profileImageView.clipsToBounds = true
  
          imagePicker = UIImagePickerController()
          imagePicker.allowsEditing = true
          imagePicker.sourceType = .photoLibrary
          imagePicker.delegate = self
      }
  
      func uploadProfileImage(_ image:UIImage, completion: @escaping ((_ url:URL?)-&gt;())) {
          guard let uid = Auth.auth().currentUser?.uid else { return }
          let storageRef = Storage.storage().reference().child("user/\(uid)")
  
          guard let imageData = UIImageJPEGRepresentation(image, 0.75) else { return }
  
          let metaData = StorageMetadata()
          metaData.contentType = "image/jpg"
  
          storageRef.putData(imageData, metadata: metaData) { metaData, error in
              if error == nil, metaData != nil {
                  if let url = metaData?.downloadURL() {
                      completion(url)
                  } else {
                      completion(nil)
                  }
                  // success!
              } else {
                  // failed
                  completion(nil)
              }
          }
      }
  }
  </code></pre>