如何在屏幕中心抖动地创建标签栏?

问题描述

限时删除！！

我尝试在尝试使用flutter在屏幕中央创建标签栏的过程中，将TabBarView放在一列中，但被卡在此错误中.请解决此问题.

I'm trying to create a tab bar at the center of the screen using flutter while trying it I gave TabBarView in a column and I was stuck in this error. Please resolve this.

I/flutter ( 3983): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════
I/flutter ( 3983): The following assertion was thrown during performResize():
I/flutter ( 3983): Horizontal viewport was given unbounded height.
I/flutter ( 3983): Viewports expand in the cross axis to fill their container and constrain their children to match
I/flutter ( 3983): their extent in the cross axis. In this case, a horizontal viewport was given an unlimited amount of
I/flutter ( 3983): vertical space in which to expand.

源代码是

class profilePage extends StatefulWidget {
  @override
  profilePageState createState() => profilePageState();
}

class profilePageState extends State<profilePage>
    with SingleTickerProviderStateMixin {
  TabController _tabController;
  @override
  void initState() {
    _tabController = new TabController(length: 2, vsync: this);
    super.initState();
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: ListView(
        children: [
          Container(
            child: Column(crossAxisAlignment: CrossAxisAlignment.center,
              children: [
                SizedBox(
                  height: 40,
                ),DefaultTabController(
                  length: 2,
                  child: Column(children: [TabBar(
                      unselectedLabelColor: Colors.black,
                      labelColor: Colors.red,
                      tabs: <Widget>[
                        Tab(
                          icon: Icon(Icons.people),
                        ),
                        Tab(
                          icon: Icon(Icons.person),
                        )
                      ],controller: _tabController,
                      indicatorSize: TabBarIndicatorSize.tab,
                    ),TabBarView(
                      children: <Widget>[Text('people'), Text('Person')],
                      controller: _tabController,
                    ),
                  ]),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

您可以看到我想要达到的图像的上述模型.我已经尝试了很多事情，但是我被困在这里.

You can see the above model of the image what I'm trying to achieve. I've tried many things but I've stuck here.

如何纠正此错误以及如何在屏幕中心创建标签栏?

How to rectify this error and how to create a tab bar at the center of my screen?

推荐答案

我添加了一个您要尝试获得的演示(我跟随了您发布的图片):

I added a demo of what you are trying to get (I followed the Image you posted):

注意:我必须对您布置小部件树的方式进行一些更改.

NOTE : I had to make few changes to the way you arranged your widget tree.

class profilePage extends StatefulWidget {
  @override
  profilePageState createState() => profilePageState();
}

class profilePageState extends State<profilePage> {

  @override
  Widget build(BuildContext context) {
    return DefaultTabController(
      length: 2,
      child: Scaffold(
        appBar: AppBar(
          title: Text(
            'My Profile',
          ),
          centerTitle: true,
          backgroundColor: Colors.grey[700].withOpacity(0.4),
          elevation: 0,
          // give the app bar rounded corners
          shape: RoundedRectangleBorder(
            borderRadius: BorderRadius.only(
              bottomLeft: Radius.circular(20.0),
              bottomRight: Radius.circular(20.0),
            ),
          ),
          leading: Icon(
            Icons.menu,
          ),
        ),
        body: Column(
          children: <Widget>[
            // construct the profile details widget here
            SizedBox(
              height: 180,
              child: Center(
                child: Text(
                  'Profile Details Goes here',
                ),
              ),
            ),

            // the tab bar with two items
            SizedBox(
              height: 50,
              child: AppBar(
                bottom: TabBar(
                  tabs: [
                    Tab(
                      icon: Icon(Icons.directions_bike),
                    ),
                    Tab(
                      icon: Icon(
                        Icons.directions_car,
                      ),
                    ),
                  ],
                ),
              ),
            ),

            // create widgets for each tab bar here
            Expanded(
              child: TabBarView(
                children: [
                  // first tab bar view widget
                  Container(
                     color: Colors.red,
                    child: Center(
                      child: Text(
                        'Bike',
                      ),
                    ),
                  ),

                  // second tab bar viiew widget
                  Container(
                     color: Colors.pink,
                    child: Center(
                      child: Text(
                        'Car',
                      ),
                    ),
                  ),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

输出:

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