flutter两个container之间出现分隔线

当布局上有两个同色container时


class MyPage extends StatefulWidget {
    
    
  MyPage({
    
    Key? key}) : super(key: key);

  @override
  _MyPageState createState() => _MyPageState();
}

class _MyPageState extends State {
    
    
  @override
  void initState() {
    
    
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    
    
    return MaterialApp(
        home: Scaffold(
            body: Center(
      child: TextButton(
          onPressed: () {
    
    
            showDialog(
                context: context,
                builder: (context) {
    
    
                  return _renderDialog();
                });
          },
          child: Text('test')),
    )));
  }

  _renderDialog() {
    
    
    return Container(
      alignment: Alignment.center,
      child: Container(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 300,
              height: 300,
              decoration: BoxDecoration(
                color: Colors.white,
              ),
            ),
            Container(
              width: 300,
              height: 99,
              decoration: BoxDecoration(
                color: Colors.white,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

在这里插入图片描述可以看到两个container之间有一条奇怪的分隔线。
原因是flutter的绘制引擎无法正确对其物理像素,出现了间隙 ,漏出了背景色,而且不知道为什么官方一直都没有修复这个严重的bug。
参考issue

解决方法:为两个container设置宽度为0,颜色为背景色的边框

return Container(
      alignment: Alignment.center,
      child: Container(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 300,
              height: 300,
              decoration: BoxDecoration(
                color: Colors.white,
                  //边框
                 border: Border.all(width: 0, color: Colors.white)
              ),
            ),
            Container(
              width: 300,
              height: 99,
              decoration: BoxDecoration(
                color: Colors.white,
                //边框
                border: Border.all(width: 0, color: Colors.white)
              ),
            ),
          ],
        ),
      ),
    );

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转载自blog.csdn.net/a1663049254/article/details/123430556