swift - 如何从 firebase 存储中获取 imageUrl 并存储在 Xcode 10 swift 4.2 中的 firebase 数据库中

Question

这是我正在使用的代码

@objc func handleSignUp() {
        guard let email = emailTextField.text, email.characters.count > 0 else { return }
        guard let username = usernameTextField.text, username.characters.count > 0 else { return }
        guard let password = passwordTextField.text, password.characters.count > 0 else { return }

    Auth.auth().createUser(withEmail: email, password: password, completion: { (user, error) in
         if let err = error {
            print("Failed to create user:", err)
            return
        }
        print("Successfully created user:", user?.user.uid)
        //            guard let image = self.plusPhotoButton.imageView?.image else { return }
        //            guard let uploadData = UIImageJPEGRepresentation(image, 0.3) else { return }
        guard let uploadData = self.plusPhotoButton.imageView?.image?.jpegData(compressionQuality: 0.3) else{return}

        let filename = NSUUID().uuidString
        Storage.storage().reference().child("profile_images").child(filename).putData(uploadData, metadata: nil, completion: { (metadata, err) in
             if let err = err {
                print("Failed to upload profile image:", err)
                return
            }
//this code isn't correct for swift4.2
//guard let profileImageUrl = metadata?.downloadURL()?.absoluteString else    { return } 


            func getDownloadURL(from path: String, completion: @escaping (URL?, Error?) -> Void) {
                let storageReference = Storage.storage().reference(forURL: "gs://instagramfirebase-60be5.appspot.com")

                let storageRef = storageReference.child(path).downloadURL(completion: completion)
            }
            print("Successfully uploaded profile image")//,profileImageUrl

            guard let uid = user?.user.uid else { return }
            let dictionaryValues = ["username": username] as [String : Any]//, "profileImageUrl": profileImageUrl
            let values = [uid: dictionaryValues]

            Database.database().reference().child("users").updateChildValues(values, withCompletionBlock: { (err, ref) in

                if let err = err {
                    print("Failed to save user info into db:", err)
                    return
                }

                print("Successfully saved user info to db")
            })
        })
    })
}

截图如下:

我对如何从 firebase 存储中获取 imageUrl 并将其存储在 Xcode 10 swift 4.2 的 firebase 数据库中感到困惑

请帮忙，谢谢你的时间。

Answer 1

您可以通过在图像上传的闭包中使用以下代码轻松获取下载 url:

storageRef.downloadURL(completion: { (url, error) in
    if let err = error{
       // error happened - implement code to handle it
       print(err)
    } else {
       // no error happened; so just continue with your code
       print(url?.absoluteString) // this is the actual download url - the absolute string
    }

请注意:不要单独存储 downloadURL，因为 Firebase 可以更改 downloadURL 的标记，我建议始终掌握完整的存储路径。

希望我能帮上忙。