how to create FBTweakAction without using macro

[vishundayal]

Hi,
I am trying to add tweaks in swift, so cant use macros. I am able to add text and switch type tweaks but not able to add action.
Although in swift, there are more option with SwiftTweaks, I dont want to add another pod.
This is how I am trying, can somebody please tell what I am doing wrong?

let tweak = FBTweak(identifier: key)
tweak.name = key
tweak.defaultValue = {
                        debugPrint("hello value")            
  UIApplication.topViewController()?.navigationController?.pushViewController(AnalyticsLogTableViewController(), animated: true)
                    }