无法获取变更请求的下载图像网址

Question

我在执行changeRequest时遇到了麻烦。我一直收到错误“类型的值'StorageMetadata'没有成员'downloadURL'”。我不确定发生了什么，或者它是否已从StorageMetadata中弃用。我很快乐，我真的不知道从哪里拿走它。一切都有帮助。谢谢！

import Foundation
import Firebase
import FirebaseAuth
import FirebaseStorage
import FirebaseDatabase

struct FirebaseService {
let dbRef = Database.database().reference()
let storageRef = Storage.storage().reference()

private func saveInfo(user: User!, username: String, password: String, city: String, state: String, bio: String) {

    //Create User Dictionary Info

    let userInfo = ["email": user.email!, "username": username, "city": city, "state": state, "bio": bio, "uid": user.uid, "photoUrl": String(describing: user.photoURL!)]

    //Create User Reference

    let userRef = dbRef.child("users").child(user.uid)

    // Save User Info in Database

    userRef.setValue(userInfo)

    //SIGN IN THE USER

    signIn(email: user.email!, password: password)
}

func signIn(email: String, password: String) {
    Auth.auth().signIn(withEmail: email, password: password, completion: { (user, error) in
        if error == nil {

            if let user = user {
                print("\(user.user.displayName) has signed in successfully!")
            }
        } else {
            print(error!.localizedDescription)
        }
    })

}

private func setUserInfo(user: User!, username: String, password: String, city: String, state: String, bio: String, data: NSData!) {

    //CREATE PATH FOR USER IMAGE
    let imagePath = "profileImage\(user.uid)/userPic.jpg"

    //CREATE IMAGE REFERANCE

    let userImageRef = storageRef.child(imagePath)

    //Create MetaData for the Image

    let metaData = StorageMetadata()
    metaData.contentType = "image/jpeg"




    //Save the user Image in the Firebase Storage File



    userImageRef.putData(data as Data, metadata: metaData) { (metaData, error) in
        if error == nil {
            let changeRequest = user.createProfileChangeRequest()
            changeRequest.displayName = username
            changeRequest.photoURL = metaData?.downloadURL()
        } else {
            print(error!.localizedDescription)
        }
    }

}

}