所以我是第一次使用 Firebase。我已经读到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 将视频从数据库中拉出?
感谢您的帮助,并原谅我对 Firebase 的缺乏经验。
所以我是第一次使用 Firebase。我已经读到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 将视频从数据库中拉出?
感谢您的帮助,并原谅我对 Firebase 的缺乏经验。
从Google I/O 上的从零到应用的谈话中,代码如下:
// 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)
}
这会获取在图像选择器中选择的图像,将其上传到 Firebase 存储,然后将该图像的生成下载 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 gist中。
这是我将视频存储到 Firebase 存储的解决方案。对于斯威夫特 3。
func uploadVideo(_ path: URL, _ userID: String,
metadataEsc: @escaping (URL, FIRStorageReference)->(),
progressEsc: @escaping (Progress)->(),
completionEsc: @escaping ()->(),
errorEsc: @escaping (Error)->()) {
let localFile: URL = path
let videoName = getName()
let nameRef = StorageHandler.videosRef.child(userID).child(videoName)
let metadata = FIRStorageMetadata()
metadata.contentType = "video"
let uploadTask = nameRef.putFile(localFile, metadata: metadata) { metadata, error in
if error != nil {
errorEsc(error!)
} else {
if let meta = metadata {
if let url = meta.downloadURL() {
metadataEsc(url, nameRef)
}
}
}
}
_ = uploadTask.observe(.progress, handler: { snapshot in
if let progressSnap = snapshot.progress {
progressEsc(progressSnap)
}
})
_ = uploadTask.observe(.success, handler: { snapshot in
if snapshot.status == .success {
uploadTask.removeAllObservers()
completionEsc()
}
})
}
func getName() -> String {
let dateFormatter = DateFormatter()
let dateFormat = "yyyyMMddHHmmss"
dateFormatter.dateFormat = dateFormat
let date = dateFormatter.string(from: Date())
let name = date.appending(".mp4")
return name
}
调用者:
StorageHandler.shared.uploadVideo(myFileURL, myUserID, metadataEsc: { (url, ref) in
print("url = \(url)") // here is the URL you can then store into your Firebase tree
print("ref = \(ref)")
}, progressEsc: { progress in
print("progress = \(progress)")
}, completionEsc: {
print("done")
}, errorEsc: { error in
print("*** Error during file upload: \(error.localizedDescription)")
})