如何从 Firebase 存储中获取 imageUrl 并将其存储在 Xcode 10 swift 4.2 中的 firebase 数据库中答案

【问题标题】：How to get imageUrl from firebase storage and store in firebase database in Xcode 10 swift 4.2如何从 Firebase 存储中获取 imageUrl 并将其存储在 Xcode 10 swift 4.2 中的 firebase 数据库中
【发布时间】：2019-03-16 04:19:11
【问题描述】：

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 中的 firebase 数据库中感到困惑

请帮忙，感谢您的宝贵时间。

【问题讨论】：

标签： swift xcode firebase xcode10 swift4.2

【解决方案1】：

您可以通过在图片上传的闭包中使用以下代码轻松获取下载网址：

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 的令牌，我建议始终抓住完整的存储路径。

希望能帮到你。

【讨论】：