让 TabBarView 占用所有剩余空间 [英] Make TabBarView take up all remaining space

问题描述

Flutter 新手，不知道如何在我的 UI 上设置大小限制，因此不会溢出.尝试使用选项卡制作一些不同的 UI，其中我在选项卡栏上方有一些组件.基本上我想要这样的东西:

New to Flutter and can't figure out how to put size constraints on my UI so nothing overflows. Trying to make a little bit different UI with tabs, where I have some components above the tab bar. Basically I want something like this:

--------------------
|     Container    |
--------------------
|      TabBar      |
--------------------
|                  |
|                  |
|    TabBarView    |
|                  |
|                  |
--------------------
|     Container    |
--------------------

问题是，我不知道如何让 TabBarView 占用剩余空间.我的代码示例甚至无法运行，只是给了我这样的错误:

The problem is, I have no idea how to make the TabBarView take up the remaining space. My code example wont even run, just gives me an error like this:

I/flutter (3875): ══╡ 渲染库╞═════════════════════════════════════════════════════I/flutter (3875):在 performResize() 期间抛出了以下断言:I/flutter (3875):水平视口被赋予了无限的高度.I/flutter(3875):视口在横轴上扩展以填充其容器并约束其子项以匹配I/flutter (3875):它们在横轴上的范围.在这种情况下，水平视口被赋予了无限量的I/flutter (3875):要扩展的垂直空间.

I/flutter ( 3875): ══╡ EXCEPTION CAUGHT BY RENDERING LIBRARY ╞═════════════════════════════════════════════════════════ I/flutter ( 3875): The following assertion was thrown during performResize(): I/flutter ( 3875): Horizontal viewport was given unbounded height. I/flutter ( 3875): Viewports expand in the cross axis to fill their container and constrain their children to match I/flutter ( 3875): their extent in the cross axis. In this case, a horizontal viewport was given an unlimited amount of I/flutter ( 3875): vertical space in which to expand.

  Widget build(BuildContext context) {
    List<Tab> myTabs = <Tab>[
      Tab(text: 'TAB 1'),
      Tab(text: 'TAB 2'),
      Tab(text: 'TAB 3'),
    ];

    Widget topBar = Container(
        padding: EdgeInsets.all(10),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceAround,
          children: <Widget>[
            Text("TEXT 1"),
            Text("TEXT 2"),
            Text("TEXT 3"),
          ],
        ));

    Widget bottomBar = Row(
      children: <Widget>[
        RaisedButton(child: Text("Cancel")),
        RaisedButton(child: Text("OK")),
      ],
    );

    return DefaultTabController(
      length: 3,
      child: Scaffold(
        appBar: AppBar(
          title: Text("Test"),
        ),
        body: Column(
          children: <Widget>[
            topBar,
            TabBar(
              tabs: myTabs,
            ),
            TabBarView(
              children: myTabs.map((Tab tab) {
                return Container(
                  color: Colors.red,
                  child: Text(tab.text)
                );
              }).toList(),
            ),
          ],
        ),
        bottomNavigationBar: bottomBar,
      ),
    );
  }

推荐答案

将 TabBarView 放入 Expanded 小部件

Put TabBarView inside Expanded widget

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