@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
        }
    })
}