Flutter IconButton的padding调小无效

转载：Padding调小解决方案

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。

const IconButton({
    Key? key,
    this.iconSize = 24.0,
    this.visualDensity,
    this.padding = const EdgeInsets.all(8.0),
    this.alignment = Alignment.center,
    this.splashRadius,
    ......

}

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) )