颤振拉伸列至全屏高度 [英] Flutter stretch columns to full screen height

问题描述

所有三个元素都位于屏幕顶部并拉伸以填充宽度，但是我希望它们可以拉伸以垂直地从上到下填充屏幕。

All three elements are at the top of the screen and stretch to fill the width, but I want them to stretch to fill the screen vertically from top to bottom.

我尝试在所有内容周围添加 Row ，但会引发错误 RenderFlex子级的flex为非零值，但传入的宽度限制不受限制？因此，我尝试将 Row 包裹在 Expanded 小部件中，从而引发错误 Expanded widgets必须放置在Flex小部件内

I tried adding a Row around everything but it throws the error RenderFlex children have non-zero flex but incoming width constraints are unbounded? So I tried wrapping that Row in an Expanded widget which throws the error 'Expanded widgets must be placed inside Flex widgets'.

return Scaffold(
  backgroundColor: Color(0xFF222222),
  body: Column(
  children: <Widget>[
    SizedBox(height: 20),
    Row(
      // crossAxisAlignment: CrossAxisAlignment.stretch,//throws error
      children: <Widget>[
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Container(
                color: Colors.red,
                child: Text('Left', textAlign: TextAlign.center),
              ),
            ],
          ),
        ),
        Expanded(
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.stretch,
            children: <Widget>[
              Container(
                color: Colors.red,
                child: Text('Right', textAlign: TextAlign.center),
              ),
            ],
          ),
        ),
      ],
    ),
    Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: <Widget>[
        Container(
          color: Colors.red,
          child: Text('Bottom', textAlign: TextAlign.center),
        ),
      ],
    ),
  ],
),
);

推荐答案

这更像您所追求的吗？

Is this more like what you are after?

每个容器包含一个允许您添加多个小部件的列。

Each container contains a column allowing you to add multiple widgets.

return Scaffold(
      backgroundColor: Color(0xFF222222),
      body: SafeArea(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: <Widget>[
            Expanded(
              child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: <Widget>[
                  Expanded(
                    child: Container(
                      color: Colors.red,
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.start,
                        children: <Widget>[
                          Text('Left', textAlign: TextAlign.center),
                          Text('Left', textAlign: TextAlign.center),
                          Text('Left', textAlign: TextAlign.center),
                        ],
                      ),
                    ),
                  ),
                  Expanded(
                    child: Container(
                      color: Colors.green,
                      child: Column(
                        mainAxisAlignment: MainAxisAlignment.end,
                        children: <Widget>[
                          Text('Right', textAlign: TextAlign.center),
                          Text('Right', textAlign: TextAlign.center),
                          Text('Right', textAlign: TextAlign.center),
                        ],
                      ),
                    ),
                  ),
                ],
              ),
            ),
            Expanded(
              child: Container(
                color: Colors.blue,
                child: Column(
                  mainAxisAlignment: MainAxisAlignment.center,
                  children: <Widget>[
                    Text('Bottom', textAlign: TextAlign.center),
                    Text('Bottom', textAlign: TextAlign.center),
                    Text('Bottom', textAlign: TextAlign.center),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );

运行代码的屏幕截图

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