ios - 无法分配给值 : function call returns immutable value ([[String:AnyObject]])

Question

为什么我在“let postObject = [String:AnyObject] = [”行收到此错误

Cannot assign to value: function call returns immutable value

    @IBAction func HandleSendButton(_ sender: Any) {
    let postRef = Storage.storage().reference().child("messages").child("\(selectedUser).[“id”]")

    let postObject = [[String:AnyObject]]() = [
        "From": [
            "uid": User.uid,
            "username": User.username,
            "photoURL": User.photoURL.absoluteString
        ],
        "Message": textView.text,
        "timestamp": [".sv":"timestamp"]
        ] as [String:Any]

    postRef.setValue(postObject, withCompletionBlock: { error, ref in
        if error == nil {
            self.dismiss(animated: true, completion: nil)
        } else {
            // Handle the error
        }
    })
}

Answer 1

只需删除 = [[String:AnyObject]]() 部分:

let postObject = [

或

let postObject: [String: Any] = [