Firebase 从 URL 中检索图像并保存在 Firebase 数据库中

Question

我已将图像保存到 Firebase 存储并将图像URL 保存到 Firebase 数据库，但是如何通过保存在 Firebase 数据库中的 URL 取回图像？这是我的保存方式

func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage, editingInfo: [String : AnyObject]?) {
    userPhoto.image = image
    dismissViewControllerAnimated(true, completion: nil)
    var data = NSData()
    data = UIImageJPEGRepresentation(userPhoto.image!, 0.8)!
    // set upload path
    let filePath = "\(FIRAuth.auth()!.currentUser!.uid)/\("userPhoto")"
    let metaData = FIRStorageMetadata()
    metaData.contentType = "image/jpg"
    self.storageRef.child(filePath).putData(data, metadata: metaData){(metaData,error) in
        if let error = error {
            print(error.localizedDescription)
            return
        } else {
            // store downloadURL
            let downloadURL = metaData!.downloadURL()!.absoluteString
            // store downloadURL at database
            self.databaseRef.child("users").child(FIRAuth.auth()!.currentUser!.uid).updateChildValues(["userPhoto": downloadURL])
        }
    }
}

Answer 1

这是一种方法，下载数据然后为其创建 UIImage：

self.storage.referenceForURL(url).dataWithMaxSize(25 * 1024 * 1024, completion: { (data, error) -> Void in
    let image = UIImage(data: data!)
    chatMessage.image = image!
    self.messages.append(chatMessage)
    self.tableView.reloadData()
    self.scrollToBottom()
})

此代码来自Zero To App talk at Google I/O. Complete code is available in this gist

Firebase 从 URL 中检索图像并保存在 Firebase 数据库中

Firebase retrieve image from URL save with Firebase database

image

firebase

swift

firebase-realtime-database

firebase-storage