添加多个自定义元数据 Firebase Storage swift

Question

I'm trying to set multiple custom metadata to Firebase Storage on Swift

my code is the following:

let metadata = StorageMetadata()
        metadata.contentType = "image/jpg"
        metadata.customMetadata = ["lightVibrantColor" : "0"]
        metadata.customMetadata = ["imageWidth" : "\(updatedProfileImage.size.width)"]
        metadata.customMetadata = ["imageHeight" : "\(updatedProfileImage.size.height)"]
        metadata.customMetadata = ["darkMutedColor" : "0"]

However, only the last custom metadata is sent. I know that because when I change the last custom metadata for another one, that is the one that is being sent.

How can I add multiple custom metadata in order to send it to Firestore?

Answer 1

From the docs , the custom metadata can be set as

let metadata = [
  "customMetadata": [
    "location": "Yosemite, CA, USA",
    "activity": "Hiking"
  ]
]

Instead of replacing the value of metadata again and again, you should use a dictionary.

Answer 2

Seems that you're overriding the value. You need to change the code to:

let metadata = StorageMetadata()
metadata.contentType = "image/jpg"
metadata.customMetadata = ["lightVibrantColor" : "0",
"imageWidth" : "\(updatedProfileImage.size)",
"imageHeight" : "\(updatedProfileImage.size.height)",
"darkMutedColor" : "0"]

Answer 3

First, you have to make instance of metadata... then, you add values to changeable property "customMetadata". After that, you connect that metadata to value that you have uploaded (in this case - image).

    let metadata = StorageMetadata()
    metadata.customMetadata = ["key" : "value", "key" : "value"]
    let uploadTask = childImage.putData(data, metadata: metadata){metadata, error in
        guard let metadata = metadata else {
            if error != nil {
                print("Error")
            }
            return
        }
    }

Then you can access your metadata and use it.