PostFragment.kt

  override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)

        viewModelpost.stateData.observe(viewLifecycleOwner, Observer { state ->
            when (state) {
                State.Loading -> button.text = "Loading"
                is State.Post -> button.text = state.text
            }
        })

        button.setOnClickListener {
            viewModelpost.getRedditPost()
        }
    }