BaseFragment

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        initView()
        viewModel.viewState.observe(viewLifecycleOwner, Observer { viewState ->
            viewState?.run {
                when (viewState) {
                    ViewState.SHOW_LOADING -> (activity as? BaseActivity<*, *>)?.showLoading()
                    ViewState.HIDE_LOADING -> (activity as? BaseActivity<*, *>)?.hideLoading()
                    else -> handleViewState(viewState)
                }
            }
        })
    }