PageView中的Flutter TextField转到PageView中的第一页

Question

我的home.dart中有一个PageView，里面有多个有状态的小部件。当我转到SearchPageTest页面时，有一个文本字段。每当我进入该文本字段时，我总是返回到PageView的第一页，在我的情况下是ImageFeedPage。

下面是我的代码，将不胜感激。

home.dart

class Home extends StatefulWidget {
  @override
  _HomeState createState() => _HomeState();
}

class _HomeState extends State<Home> {
  PageController pageController;
  int pageIndex = 0;

  @override
  void initState() {
    super.initState();
    pageController = PageController();
  }

  @override
  void dispose() {
    pageController.dispose();

    super.dispose();
  }

  onPageChanged(int pageIndex) {
    if (pageIndex != 2) {
      setState(() {
        this.pageIndex = pageIndex;
      });
    }
  }

  onTap(int pageIndex, User user) {
    if (user.documentID == null) {
      Navigator.pushNamed(context, '/loginRegister');
    } else {
      if (pageIndex == 2) {
        AddProductPage.show(context);
      } else {
        pageController.animateToPage(
          pageIndex,
          duration: Duration(milliseconds: 300),
          curve: Curves.easeInOut,
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    final user = Provider.of<User>(context);

    return Scaffold(
      body: PageView(
        children: <Widget>[
          ImageFeedPage(), // <-- Tapping on text field always comes back here
          SearchPageTest(),
          new Container(),
          ClosetPage(),
          ChatPage(),
        ],
        controller: pageController,
        onPageChanged: onPageChanged,
        physics: NeverScrollableScrollPhysics(),
      ),
      bottomNavigationBar: CupertinoTabBar(
        backgroundColor: Colors.white,
        currentIndex: pageIndex,
        onTap: (pageIndex) => onTap(pageIndex, user),
        activeColor: Theme.of(context).primaryColor,
        items: _buildMenuItems(),
      ),
    );
  }

  List<BottomNavigationBarItem> _buildMenuItems() {
    return [
      BottomNavigationBarItem(
        icon: Icon(Icons.home),
      ),
      BottomNavigationBarItem(
        icon: Icon(Icons.search),
      ),
      BottomNavigationBarItem(
        backgroundColor: Colors.green,
        title: Text(
          'Sell Now',
          style: TextStyle(
            color: Colors.cyan,
            fontWeight: FontWeight.bold,
          ),
        ),
        icon: Container(
          child: Icon(
            Icons.photo_camera,
            size: 40.0,
            color: Colors.cyan,
          ),
        ),
      ),
      BottomNavigationBarItem(
        icon: Icon(Icons.favorite),
      ),
      BottomNavigationBarItem(
        icon: Icon(Icons.chat),
      ),
    ];
  }
}

searchPageTest.dart

class SearchPageTest extends StatefulWidget {
  @override
  _SearchPageTestState createState() => _SearchPageTestState();
}

class _SearchPageTestState extends State<SearchPageTest> {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('Search Page'),
        actions: <Widget>[],
      ),
      body: _buildBody(context),
      drawer: Sidebar(),
    );
  }

  _buildBody(BuildContext context) {
    return Column(
      mainAxisAlignment: MainAxisAlignment.start,
      mainAxisSize: MainAxisSize.max,
      crossAxisAlignment: CrossAxisAlignment.start,
      children: <Widget>[
        Padding(
          padding: const EdgeInsets.fromLTRB(10.0, 0, 10.0, 10.0),
          child: TextField(),
        ),
      ],
    );
  }
}