class MyFragment : Fragment() {
    private lateinit var job : Job

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        super.onViewCreated(view, savedInstanceState)
        job = viewLifecycleOwner.lifecycleScope.launch {
            while (true) {
                Log.e("lifecycleScope", "launchWithDelay")
                delay(1000)
            }
        }
    }

    override fun onDestroyView() {
        Log.e("onDestroyView", "job isCancelled : ${job.isCancelled}")
        super.onDestroyView()
    }
}