如何从 firebase 存储中检索数据

Question

Hey I am trying to retrieve the user image saved in the firebase storage but I am using this storage path (the folder of profile pictures in firebase) as a string(child path) to update the user image. When the user profile updates there are no errors this code just didn't update the user image as I expected what am I missing here that will allow me to successfully my user image and solve my problem?

                            var spaceRef = Storage.storage().reference()
                        let storagePath = "gs://tunnel-vision-bc055.appspot.com/images/space.jpg"
                        spaceRef = Storage.storage().reference(forURL: storagePath)
                       let reference = spaceRef.child("profilePic")

                        // UIImageView in your ViewController
                        let imageView: UIImageView = self.ProfileImage

                        // Placeholder image
                        let placeholderImage = UIImage(named: "image/jpeg")

                        // Load the image using SDWebImage
                        imageView.sd_setImage(with: reference, placeholderImage: placeholderImage)
                            // Uh-oh, an error occurred!
                            return
                          }

Answer 1

This will not be the answer to all your issues, but hopefully some of them.

First of all, in Swift, variables and constants starts with a lowercase letter. Classes with uppercase. For example, your ProfileImage should be profileImage. For clarity, when I type profileImage I refer to your ProfileImage.

Now, types. You have a constant profileImage in the code you posted. This is of type String. You set the value of the key "ProfileImageUrl" to it. I would change it's name to profileImageURL.

Then (according to one of your comments) you are calling self.profileImage

let imageView: UIImageView = self.profileImage

Since you're not seeing any errors I assume you also have a class property called profileImage of type UIImageView.

The line

// let user = User(ProfileImage: ProfileImage)

will not help you. As far as I understand from the code you posted - and what you are trying to achieve - you may as well delete it. Or comment it (//) as I did above.

What you want to do is to set an imageView's image.

For this you need to do

imageView.image = image

And to be able to do that you need an imageView and an image. If you don't know how to create an imageView, search for answers here on SO.

You can then create the image from the url you get from Firebase and set it to the imageView. Kind of like this

let profileImageURL = value?["ProfileImageUrl"] as? String ?? ""
let url = URL(string: profileImageURL)

DispatchQueue.global().async {
    guard let data = Data(contentsOf: url) else {return} // if url is nil, return block is executed and code below is not
    DispatchQueue.main.async {
        self.imageView.image = UIImage(data: data)
    }
}