遇到的问题

Flutter IconButton的padding调小无效

IconButton中padding的默认值是8.0。因为IconButton遵守Material Design设计规则，需要将边距的最小值设置为48px，所以无法调小padding。

调小的解决方案：

方案1、

Container(
  padding: const EdgeInsets.all(0.0),
  width: 30.0, // you can adjust the width as you need
  child: IconButton(
  ),
),

方案2、

GestureDetector( onTap: () {}, child: Icon(Icons.volume_up) ) 

flutter 使用GestureDetector点击没有反应

正常使用是

GestureDetector(
   onTap: () {
   },
   child: Text("demo"),
),

但有时候点击之后没有反应，原因：点击部分处于空白区域，没有接收到点击事件；

解决方法：

GestureDetector(
   behavior: HitTestBehavior.opaque,
   onTap: () {
   },
   child: Text("demo"),
),
原文链接：https://blog.csdn.net/qq_38544862/article/details/109534548

一个组件/界面 debug包报错但能显示,release包直接不显示

https://stackoverflow.com/questions/54905388/incorrect-use-of-parent-data-widget-expanded-widgets-must-be-placed-inside-flex

First Rule: use Expanded only within a column, row or flex.

Second Rule: Parent column that have expanded child column must be wrapped with expanded as well

1. Under ListView don't use Spacer Widget
2. don't use Positioned under Row or Column
3. Expanded can only use it must be a descendant of Column Row Flex