Firebase：如何将视频存储在存储中，然后将视频 URL 存储在数据库中？

Question

所以我第一次使用 Firebase。我读过您应该将视频存储在 Storage 中，然后将该唯一 URL 存储在他们的数据库中。我将如何采取这种方法？例如，如果用户请求播放特定视频，我将如何从数据库中获取 URL，然后使用该 URL 从数据库中提取视频？

感谢您的帮助，请原谅我对 Firebase 的经验不足。

Answer 1

Google I/O 上的“从零到应用程序”演讲中包含以下代码：

// pragma mark - UIImagePickerDelegate overrides
func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {

  // Get local file URLs
  guard let image: UIImage = info[UIImagePickerControllerOriginalImage] as? UIImage else { return }
  let imageData = UIImagePNGRepresentation(image)!
  guard let imageURL: NSURL = info[UIImagePickerControllerReferenceURL] as? NSURL else { return }

  // Get a reference to the location where we'll store our photos
  let photosRef = storage.reference().child("chat_photos")

  // Get a reference to store the file at chat_photos/<FILENAME>
  let photoRef = photosRef.child("\(NSUUID().UUIDString).png")

  // Upload file to Firebase Storage
  let metadata = FIRStorageMetadata()
  metadata.contentType = "image/png"
  photoRef.putData(imageData, metadata: metadata).observeStatus(.Success) { (snapshot) in
    // When the image has successfully uploaded, we get it's download URL
    let text = snapshot.metadata?.downloadURL()?.absoluteString
    // Set the download URL to the message box, so that the user can send it to the database
    self.messageTextField.text = text
  }

  // Clean up picker
  dismissViewControllerAnimated(true, completion: nil)
}

这将获取在图像选择器中选择的图像，将其上传到 Firebase Storage，然后将该图像的下载 URL 设置到文本字段中：

// Send a chat message
func sendMessage(sender: AnyObject) {
  // Create chat message
  let chatMessage = ChatMessage(name: self.username, message: messageTextField.text!, image: nil)
  messageTextField.text = ""

  // Create a reference to our chat message
  let chatRef = database.reference().child("chat")

  // Push the chat message to the database
  chatRef.childByAutoId().setValue(["name": chatMessage.name, "message": chatMessage.message])
}

然后该sendMessage方法将文本从文本框发送到数据库。

这个最小示例的完整代码在这个要点中。