flutter实践：慎用Expanded

问题：在一个Android原生的弹框里显示flutter view,由于使用了Expanded导致组件未显示出来

最神奇的地方在于debug调试模式显示正常，然后用release版本发布时怎么都显示不出来，还导致点击后无响应ANR

问题代码：

Dart 复制代码

child: StatefulBuilder(
        builder: (context, setState) {
          return Expanded(
            child: Container(
              padding: const EdgeInsets.fromLTRB(10, 0, 10, 0),
              decoration: BoxDecoration(
                  borderRadius: newStyle
                      ? const BorderRadius.only(
                          topLeft: Radius.circular(12),
                          topRight: Radius.circular(12),
                          bottomLeft: Radius.circular(0),
                          bottomRight: Radius.circular(0),
                        )
                      : BorderRadius.circular(4),
                  color: themeData.fillBase),
              child: Column(
                mainAxisAlignment: MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.stretch,
                children: _buildSettingColumn(),
              ),
            ),
          );
        },
      ),

修改后代码：

Dart 复制代码

child: StatefulBuilder(
        builder: (context, setState) {
          return Container(
            width: 200,
            padding: const EdgeInsets.fromLTRB(10, 0, 10, 0),
            decoration: BoxDecoration(
                borderRadius: newStyle
                    ? const BorderRadius.only(
                        topLeft: Radius.circular(12),
                        topRight: Radius.circular(12),
                        bottomLeft: Radius.circular(0),
                        bottomRight: Radius.circular(0),
                      )
                    : BorderRadius.circular(4),
                color: themeData.fillBase),
            child: Column(
              mainAxisAlignment: MainAxisAlignment.start,
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: _buildSettingColumn(),
            ),
          );
        },
      ),

总结：自己挖的坑给自己上了一课，过程中最困难的是release版本有问题时难以定位，最后还是回退代码才发现的。