UserSearchViewController.swift

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    if let user = currentUser, let friendID = resultsArray[indexPath.row]["uid"] {
        friendsRef.child("\(user.uid)/\(friendID)").setValue("true")
        if let userCell = tableView.cellForRow(at: indexPath) as? UserTableViewCell {
            UIView.animate(withDuration: 0.2) {
                userCell.detailLabel.alpha = 1
            }
        }
    }

    tableView.deselectRow(at: indexPath, animated: true)
}