title: Flutter iOS: taps on the status bar can't scroll to top
body: <p>CustomScrollView used in home page layout
  If you want to pull up and load more, you must define a ScrollController and pass it to CustomScrollView.</p>
  
  <p>My code</p>
  
  <pre><code>ScrollController _scrollController = new ScrollController();
    @override
    void initState() {
      super.initState();
      _scrollController.addListener(() {
        if (_scrollController.position.pixels &gt;=
            _scrollController.position.maxScrollExtent) {
          _loadMoreData();
        }
      });
    }
  
    @override
    void dispose() {
      super.dispose();
      _scrollController.dispose();
    }
  new CustomScrollView(
    controller: _scrollController,
    slivers: &lt;Widget&gt;[....],
  )
  </code></pre>
  
  <p>However, if this is done, when there is a lot of data loaded, tap the status bar at the top will not scroll to the top!
  If you remove the controller in CustomScrollView, or change to PrimaryScrollController.of(context)</p>
  
  <pre><code>new CustomScrollView(
    controller: PrimaryScrollController.of(context),
  )
  </code></pre>
  
  <p>this is OK!
  why ???</p>