用户名的Firebase存储映像

Question

I have saved my users profile images in Firebase Storage by username.

How do I retrieve the image for a user?

I keep getting the same error message:

unexpectedly found nil while unwrapping an Optional value

Here is my code:

let filePath = "\("profileImage/\(self.userNameText.text!)")"
        self.storageRef.child(filePath).data(withMaxSize: INT64_MAX, completion: { (data, error) in
            let profileImage = UIImage(data: data!)
            self.profileImage.image = profileImage
            })

Answer 1

unexpectedly found nil while unwrapping an Optional value means that you're trying to use a value that's returning nil so it doesn't exist.

On what exact line are you getting this error?

Answer 2

It seems like FirebaseStorage couldn't find your image. I've adjusted an example for you so you can read the error message you'll get.

let filePath = String(format:"profileImage/%@", self.userNameText.text!)

// Create a reference to the file you want to download
let islandRef = storageRef.child(filePath)

// Download in memory with a maximum allowed size of 1MB (1 * 1024 * 1024 bytes)
islandRef.data(withMaxSize: 1 * 1024 * 1024) { data, error in
  if let error = error {
    // Uh-oh, an error occurred!
    print(error.localizedDescription)
  } else {
    // Data for "images/island.jpg" is returned
    let image = UIImage(data: data!)
  }
}