flutter遇到的问题

iconButton 有padding

# 因为iconButton 有一个最小的48px的约束  
IconButton(
     padding: EdgeInsets.zero, // 将padding改为0 
     constraints: BoxConstraints(),   // 取消约束
     icon: Icon(Icons.keyboard_arrow_right),
     onPressed: () {
     print('121');
     },
   )
  # 第二种方法
  Container(
    padding: const EdgeInsets.all(0.0),
    width: 30.0, // you can adjust the width as you need
    child: IconButton(
  ),
)