如何向底部应用栏添加多行

Question

我可以在flutter中修改bottomappbar使其看起来像这样吗，还是应该使用容器来具有多个这样的按钮。

我已经使用bootomappbar进行了尝试，但是我不知道如何具有多行。

BottomAppBar(
        child: Container(
          height: 150,
          child: Row(
            mainAxisSize: MainAxisSize.max,
            mainAxisAlignment: MainAxisAlignment.spaceEvenly,
            children: <Widget>[
              IconButton(
                iconSize: 30.0,
                padding: EdgeInsets.only(left: 28.0),
                icon: Icon(Icons.search),
                onPressed: () {
                }
              ),
              IconButton(
                iconSize: 30.0,
                padding: EdgeInsets.only(left: 28.0),
                icon: Icon(Icons.search),
                onPressed: () {
                },
              ),
              IconButton(
                iconSize: 30.0,
                padding: EdgeInsets.only(right: 28.0),
                icon: Icon(Icons.search),
                onPressed: () {
                },
              ),
              IconButton(
                iconSize: 30.0,
                padding: EdgeInsets.only(right: 28.0),
                icon: Icon(Icons.search),
                onPressed: () {
                },
              ),

Answer 1

添加Column和多个Rows

bottomNavigationBar: BottomAppBar(
    child: Container(
      height: 150,
      child: Column(
        children: <Widget>[
          Row(
              mainAxisSize: MainAxisSize.max,
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: <Widget>[
                IconButton(
                    iconSize: 30.0,
                    padding: EdgeInsets.only(left: 28.0),
                    icon: Icon(Icons.search),
                    onPressed: () {}),
                IconButton(
                  iconSize: 30.0,
                  padding: EdgeInsets.only(left: 28.0),
                  icon: Icon(Icons.search),
                  onPressed: () {},
                ),
                IconButton(
                  iconSize: 30.0,
                  padding: EdgeInsets.only(right: 28.0),
                  icon: Icon(Icons.search),
                  onPressed: () {},
                ),
              ]),
          Row(
              mainAxisSize: MainAxisSize.max,
              mainAxisAlignment: MainAxisAlignment.spaceEvenly,
              children: <Widget>[
                IconButton(
                    iconSize: 30.0,
                    padding: EdgeInsets.only(left: 28.0),
                    icon: Icon(Icons.search),
                    onPressed: () {}),
                IconButton(
                  iconSize: 30.0,
                  padding: EdgeInsets.only(left: 28.0),
                  icon: Icon(Icons.search),
                  onPressed: () {},
                ),
                IconButton(
                  iconSize: 30.0,
                  padding: EdgeInsets.only(right: 28.0),
                  icon: Icon(Icons.search),
                  onPressed: () {},
                ),
              ]),
        ],
      ),
    ),
  ),