如何通过 Firebase 从我的 iOS 应用程序上传和检索图像？

Question

我想将图像从我的一个视图控制器上传到 Firebase，然后我想将上传的图像加载到另一个视图控制器。我也希望这个过程继续为无限的用户。我不知道该怎么做。

Answer 1

• 您必须将图片上传到 Firebase，如下所示

  // Data in memory
  let data: NSData = ...
  
  // Create a reference to the file you want to upload
  let riversRef = storageRef.child("images/rivers.jpg")
  
  // Upload the file to the path "images/rivers.jpg"
  let uploadTask = riversRef.putData(data, metadata: nil) { metadata, error in
  if (error != nil) {
  // Uh-oh, an error occurred!
  } else {
  // Metadata contains file metadata such as size, content-type, and download URL.
  let downloadURL = metadata!.downloadURL
  }
  }
  

• 之后，您可以检索如下图像

  // Create a reference to the file you want to download
  let islandRef = storageRef.child("images/island.jpg")
  
  // Download in memory with a maximum allowed size of 1MB (1 * 1024 * 1024 bytes)
  islandRef.dataWithMaxSize(1 * 1024 * 1024) { (data, error) -> Void           in
  if (error != nil) {
  // Uh-oh, an error occurred!
  } else {
  // Data for "images/island.jpg" is returned
  // ... let islandImage: UIImage! = UIImage(data: data!)
  }
  }
  

• 您还可以在https://firebase.google.com/docs/storage/ios/中找到完整的参考资料