嘗試將圖像上傳到 firebase (Swift) 時出錯

Question

我有以下代碼：

func upload() {
        let localFile = usersImg!

        // Create the file metadata
        let metadata = StorageMetadata()
        metadata.contentType = "image/jpeg"
        let storageRef = Storage.storage().reference()

        // Upload file and metadata to the object 'images/mountains.jpg'
        let uploadTask = storageRef.putFile(from: localFile, metadata: metadata)

        // Listen for state changes, errors, and completion of the upload.
        uploadTask.observe(.resume) { snapshot in
          // Upload resumed, also fires when the upload starts
        }

        uploadTask.observe(.pause) { snapshot in
          // Upload paused
        }

        uploadTask.observe(.progress) { snapshot in
          // Upload reported progress
          let percentComplete = 100.0 * Double(snapshot.progress!.completedUnitCount)
            / Double(snapshot.progress!.totalUnitCount)
        }

        uploadTask.observe(.success) { snapshot in
          // Upload completed successfully
        }

        uploadTask.observe(.failure) { snapshot in
            if let error = snapshot.error as NSError? {
            switch (StorageErrorCode(rawValue: error.code)!) {
            case .objectNotFound:
              // File doesn't exist
              break
            case .unauthorized:
              // User doesn't have permission to access file
              break
            case .cancelled:
              // User canceled the upload
              break

            /* ... */

            case .unknown:
              // Unknown error occurred, inspect the server response
              break
            default:
              // A separate error occurred. This is a good place to retry the upload.
              break
            }
          }
        }
            
    }

userImg變量只是用戶選擇的圖像，如果我要打印它，它看起來像這樣：

Optional(file:///var/mobile/Media/DCIM/100APPLE/IMG_0030.PNG)

但是，當我運行我的代碼並調用該方法時，出現以下錯誤：

Thread 12: "*** -[__NSPlaceholderDictionary initWithObjects:forKeys:count:]: attempt to insert nil object from objects[1]"

這是什么意思，我做錯了什么。 （順便說一句，我嘗試了很多不同的方法來將 url 上傳到 firebase，但是對於每個人我都遇到了奇怪的錯誤，所以這段代碼直接來自 firebase 網站。

Answer 1

我不能保證任何事情，因為我沒有使用相同的代碼，盡管我不得不更改我的 firebase 存儲的規則，這很有幫助！