flutter 拉伸(stretch)列到全屏高度

Question

这三个元素都在屏幕的顶部并拉伸(stretch)以填充宽度，但我希望它们从上到下垂直拉伸(stretch)以填充屏幕。

我尝试在所有内容周围添加一个 Row 但它抛出错误 RenderFlex children have non-zero flex but incoming width constraints are unbounded?所以我尝试将 Row 包装在 Expanded 小部件中，这会引发错误“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),
        ),
      ],
    ),
  ],
),
);

Answer 1

这更像您想要的吗？

每个容器包含一列，允许您添加多个小部件。

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),
                  ],
                ),
              ),
            ),
          ],
        ),
      ),
    );