'StorageMetadata' has no member 'downloadURL' - ios

Question

So, I've gotten 2 more errors in my code which I've tried to solve for a while for my school project, but since I'm not used to programming in swift I haven't been able to solve it (I've taken code from a youtube tutorial). The first one is "Value of 'StorageMetaData' has no member 'downloadURL' (inside the func uploadImg). Then the other erros is "use of unresolved identifier 'imagePicker' (at the end of #IBAction func selectedImgPicker".
Here's my code:
class SignUpVC: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
#IBOutlet weak var userImagePicker: UIImageView!
#IBOutlet weak var usernameField: UITextField!
#IBOutlet weak var signUpBtn: UIButton!
var userUid: String!
var emailField: String!
var passwordField: String!
var imagePicker: UIImagePickerController!
var imageSelected = false
var username: String!
override func viewDidLoad() {
super.viewDidLoad()
imagePicker.delegate = self as? UIImagePickerControllerDelegate & UINavigationControllerDelegate
imagePicker = UIImagePickerController()
imagePicker.allowsEditing = true
}
override func viewDidDisappear(_ animated: Bool) {
if let _ = KeychainWrapper.standard.string(forKey: "uid"){
performSegue(withIdentifier: "Message", sender: nil)
}
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]){
if let image = info[UIImagePickerControllerEditedImage] as? UIImage{
userImagePicker.image = image
imageSelected = true
} else {
print("image wasnt selected")
}
imagePicker.dismiss(animated: true, completion: nil)
}
func setUser(img: String){
let userData = ["username": username!, "userImg": img]
KeychainWrapper.standard.set(userUid, forKey: "uid")
let location = Database.database().reference().child("users").child(userUid)
location.setValue(userData)
dismiss(animated: true, completion: nil)
}
func uploadImg(){
if usernameField.text == nil {
signUpBtn.isEnabled = false
} else {
username = usernameField.text
signUpBtn.isEnabled = true
}
guard let img = userImagePicker.image, imageSelected == true else{
print("image needs to be selected")
return
}
if let imgData = UIImageJPEGRepresentation(img, 0.2){
let imgUid = NSUUID().uuidString
let metadata = StorageMetadata()
metadata.contentType = "image/jpeg"
Storage.storage().reference().putData(imgData, metadata: metadata){
(metadata, error) in
if error != nil{
print("did not upload image")
}else{
print("uploaded")
let downloadURL = metadata?.downloadURL()?.absoluteString
if let url = downloadURL{
self.setUser(img: url)
}
}
}
}
}
#IBAction func createAccount(_ sender: AnyObject){
Auth.auth().createUser(withEmail: emailField, password: passwordField, completion: {
(user, error) in
if error != nil {
print("Cant create user")
} else {
if let user = user {
self.userUid = user.user.uid
}
}
self.uploadImg()
})
}
#IBAction func selectedImgPicker (_ sender: AnyObject){
present(imagePicker, animated: true, completion: nil)
}
#IBAction func cancel (_ sender: AnyObject){
dismiss(animated: true, completion: nil)
}
}