将多个图像存储到 Firebase 并获取 url

Question

我有 100 张图片要存储在 Firebase 存储中，但我还需要从中提取网址。有自动的方法吗？

如果没有，是否有更好的服务提供商允许上传大量图片并自动提取网址？？

Answer 1

我强烈建议同时使用 Firebase 存储和 Firebase 实时数据库来完成此任务。下面是一些显示这些部分如何交互的代码（Swift）：

共享：

// Firebase services
var database: FIRDatabase!
var storage: FIRStorage!
...
// Initialize Database, Auth, Storage
database = FIRDatabase.database()
storage = FIRStorage.storage()

上传：

let fileData = NSData() // get data...
let storageRef = storage.reference().child("myFiles/myFile")
storageRef.putData(fileData).observeStatus(.Success) { (snapshot) in
  // When the image has successfully uploaded, we get it's download URL
  // This "extracts" the URL, which you can then save to the RT DB
  let downloadURL = snapshot.metadata?.downloadURL()?.absoluteString
  // Write the download URL to the Realtime Database
  let dbRef = database.reference().child("myFiles/myFile")
  dbRef.setValue(downloadURL)
}

下载：

let dbRef = database.reference().child("myFiles")
dbRef.observeEventType(.ChildAdded, withBlock: { (snapshot) in
  // Get download URL from snapshot
  let downloadURL = snapshot.value() as! String
  // Create a storage reference from the URL
  let storageRef = storage.referenceFromURL(downloadURL)
  // Download the data, assuming a max size of 1MB (you can change this as necessary)
  storageRef.dataWithMaxSize(1 * 1024 * 1024) { (data, error) -> Void in
    // Do something with downloaded data...
  })
})

有关详细信息，请参阅Zero to App: Develop with Firebase，它是associated source code，了解如何执行此操作的实际示例。