flutter - 如何在 flutter 中实现圆形的底部应用栏？

Question

我想创建一个像这样的圆形底部应用栏。
圆形底部应用栏:

但它看起来像这样......编码的BottomAppBar:

我如何摆脱那个白色部分？

    return ClipRRect(
      borderRadius: BorderRadius.only(
        topLeft: Radius.circular(25),
        topRight: Radius.circular(25),
        bottomRight: Radius.circular(25),
        bottomLeft: Radius.circular(25),
      ),
      child: Padding(
        padding: const EdgeInsets.only(bottom:20.0),
        child: BottomAppBar(
    
   shape: CircularNotchedRectangle(),
   child: new Row(
        
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        
        children: <Widget>[
          IconButton(
            icon: Icon(Icons.menu),
            color: Colors.white,
            onPressed: () {},
          ),
          IconButton(
            icon: Icon(Icons.search),
            color: Colors.white,
            onPressed: () {},
          ),
        ],
    ),
    color: Colors.blueGrey,
    ),
      )
    ); ```

Answer 1

应用栏小部件有一个 shape 属性，这就是您应该使用以获得所需结果的属性，请将您的代码更改为此

BottomAppBar(
    shape: RoundedRectangleBorder(
      borderRadius: BorderRadius.all(
        topLeft: Radius.circular(25),
        topRight: Radius.circular(25),
        bottomRight: Radius.circular(25),
        bottomLeft: Radius.circular(25),
      ),
    ),
   ... //Your codes
  ),