將圖片從設備上傳到Firebase

Question

我一直試圖將圖像上傳到Firebase，然后將其設置為用戶的個人資料圖片。 出於某種原因，圖片的url地址為null，並且我相信它與該函數中的元數據有關：

func uploadProfileImage(_ image:UIImage, completion: @escaping((_url:URL?)->()))
{

    guard let uid = Auth.auth().currentUser?.uid else { return }

    let storageRef = Storage.storage().reference().child("user/\(uid)")

    guard let imageData = image.jpegData(compressionQuality: 0.5) else {return}


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

    storageRef.putData(imageData, metadata: metaData) { metaData, error in
        if error == nil, metaData != nil {

            storageRef.downloadURL { url, error in
                completion(url)
                // success!
            }
        }
    }
}

在complition中返回的url為nil或錯誤！= nil，metaData == nil

Answer 1

以下是將圖像添加到Firebase存儲和數據庫中以供以后使用Swift 4使用的工作代碼

func uploadProfileImage（）{

    let storedImage = storagebaseRef.child("yourLocation")

    if let uploadData = UIImageJPEGRepresentation(yourImg, 1) 
    {
        storedImage.putData(uploadData, metadata: nil, completion: { (metadata, error) in
            if error != nil {

            }
            storedImage.downloadURL(completion: { (url, error) in
                if error != nil {
                }

                if let urlText = url?.absoluteString {                      
                        self.databaseRef.child("yourLocation").updateChildValues(["pic" : urlText], withCompletionBlock: { (error, ref) in
                           if error != nil {                        
                               self.showAlert(message: "Please Try Again", title: "Error")
                               return
                           }
                        })
                }           
            })       
        })
    }  
}

Answer 2

這是一種快速解決方案，可以上傳具有給定文件名的圖像，然后獲取URL並將其存儲在此用戶個人資料中。

目前尚不清楚問題中使用了元數據。

這是未經測試的，所以可能有錯字。

func setUsersPhotoURL(withImage: UIImage, andFileName: String) {
    guard let imageData = withImage.jpegData(compressionQuality: 0.5) else { return }
    let storageRef = Storage.storage().reference()
    let thisUserPhotoStorageRef = storageRef.child("this users uid").child(andFileName)

    let uploadTask = thisUserPhotoStorageRef.putData(imageData, metadata: nil) { (metadata, error) in
        guard let metadata = metadata else {
            print("error while uploading")
            return
        }

        thisUserPhotoStorageRef.downloadURL { (url, error) in
            print(metadata.size) // Metadata contains file metadata such as size, content-type.
            thisUserPhotoStorageRef.downloadURL { (url, error) in
                guard let downloadURL = url else {
                    print("an error occured after uploading and then getting the URL")
                    return
                }

                let changeRequest = Auth.auth().currentUser?.createProfileChangeRequest()
                changeRequest?.photoURL = downloadURL
                changeRequest?.commitChanges { (error) in
                    //handle error
                }
            }
        }
    }
}